diff --git a/Code/.gitkeep b/Code/.gitkeep
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git a/Code/Huzzah32/server/server.ino b/Code/Huzzah32/server/server.ino
new file mode 100644
index 0000000000000000000000000000000000000000..5eff0785d3f6935bf555cc252497e628fba2bd11
--- /dev/null
+++ b/Code/Huzzah32/server/server.ino
@@ -0,0 +1,354 @@
+// Load Wi-Fi library
+#include <WiFi.h>
+#define LOG_LOCAL_LEVEL ESP_LOG_VERBOSE
+#include "esp_log.h"
+
+// Replace with your network credentials
+const char* ssid     = "MicHub";
+const char* password = "0123456789";
+
+int lastBlink;
+int blinkState;
+
+// Set web server port number to 80
+WiFiServer server(80);
+
+// Variable to store the HTTP request
+String header;
+
+// Auxiliar variables to store the current output state
+String recordingState = "off";
+String boardState = "not responding";
+
+// Assign output variables to GPIO pins
+const int ledPin = 13;
+
+#define BUF_SIZE (255)
+uint8_t buf[BUF_SIZE];
+
+#define BoardInit 0  /* Initializing */
+#define BoardReady 1   /* Ready to respond */
+#define BoardRecording 2   /* Recording */
+#define BoardTransmitting 3   /* Transmitting */
+#define BoardError 4     /* Error occurred, restart */
+
+/*
+// Set your Static IP address
+IPAddress local_IP(192, 168, 1, 184);
+// Set your Gateway IP address
+IPAddress gateway(192, 168, 1, 1);
+
+IPAddress subnet(255, 255, 0, 0);
+*/
+
+void setup() {
+  Serial.begin(115200);
+  
+  //Serial1.begin(1843200);
+  Serial1.begin(2000000);
+  
+  Serial1.write(2);// Flush old data
+  while(Serial1.available() > 0) {Serial1.read();}
+
+  // Initialize the output variables as outputs
+  pinMode(ledPin, OUTPUT);
+  digitalWrite(ledPin, HIGH);
+  lastBlink = 0;
+  blinkState = 0;
+  
+  connect();
+
+  server.begin();
+
+  readMode();
+}
+
+void connect() {
+  // Connect to Wi-Fi network with SSID and password
+  Serial.print("Connecting to ");
+  Serial.println(ssid);
+/*
+  if (!WiFi.config(local_IP, gateway, subnet)) {
+    Serial.println("STA Failed to configure");
+  }
+  */
+  
+  WiFi.begin(ssid, password);
+  WiFi.setSleep(false); 
+  
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi connected");
+  Serial.println("IP address: ");
+  Serial.println(WiFi.localIP());
+}
+
+void readMode() {
+  // Flush
+  while(Serial1.available() > 0) {Serial1.read();}
+  
+  Serial1.println("status");
+  int reqtime = millis();
+  while(Serial1.available() == 0 && millis()-reqtime < 1000) { }
+  
+  Serial.println(Serial1.available());
+  
+  if (Serial1.available() == 0) {
+    boardState = "not responding";
+  } else {    
+    byte boardMode = Serial1.read();
+    Serial.println(boardMode);
+    
+    switch(boardMode) {
+      case BoardInit: boardState = "initializing"; break;
+      case BoardReady: boardState = "ready"; break;
+      case BoardRecording: boardState = "recording"; break;
+      case BoardTransmitting: boardState = "transmitting"; break;
+      case BoardError: boardState = "in error mode"; break;   
+      default: boardState = "non-responsive"; break;  
+    }
+  }
+
+  // Flush
+  while(Serial1.available() > 0) {Serial1.read();}
+}
+
+void loop() {
+  if (boardState == "ready") 
+  {
+    digitalWrite(ledPin, HIGH);
+    lastBlink = 0;
+    blinkState = 0;
+  } else if (boardState != "recording") {
+    digitalWrite(ledPin, LOW);
+    lastBlink = 0;
+    blinkState = 0;
+  } else { /* Recording */
+    if (blinkState == 0) {
+      digitalWrite(ledPin, LOW);
+      lastBlink = millis();
+      blinkState = 1;
+    }  else if (blinkState == 1 && millis()-lastBlink > 1000) {
+      digitalWrite(ledPin, HIGH);
+      lastBlink = millis();
+      blinkState = 2;
+    }  else if (blinkState == 2 && millis()-lastBlink > 1000) {
+      digitalWrite(ledPin, LOW);
+      lastBlink = millis();
+      blinkState = 1;
+    }
+  }
+  if (!WiFi.isConnected()) {
+    Serial.print("Reconnecting...");
+    connect();
+  }
+  WiFiClient client = server.available();   // Listen for incoming clients
+  if (client && client.connected()) {       // If a new client connects,
+    Serial.println("New Client.");          // print a message out in the serial port
+    String currentLine = "";                // make a String to hold incoming data from the client
+    while (client.connected()) {            // loop while the client's connected
+      if (client.available()) {             // if there's bytes to read from the client,
+        char c = client.read();             // read a byte, then
+        //Serial.write(c);                    // print it out the serial monitor
+        header += c;
+        if (c == '\n') {                    // if the byte is a newline character
+                   
+          // if the current line is blank, you got two newline characters in a row.
+          // that's the end of the client HTTP request, so send a response:
+          if (currentLine.length() == 0) {
+            readMode();
+            
+            
+            int i = header.indexOf("/dl/");
+            if (i >= 0 && boardState == "ready") {
+              int s = header.indexOf("\n",i);
+              String dlfile = header.substring(i+4,s-1);
+              s = dlfile.indexOf(" ");
+              if (s >= 0) {
+                dlfile = dlfile.substring(0,s);
+              }
+              String command = "get " + dlfile;
+              
+              Serial.println(dlfile);
+
+              // Flush old data
+              while(Serial1.available() > 0) {Serial1.read();}
+              
+              Serial1.println(command);
+              String dlsize = "";
+              while(true)
+              {
+                if (Serial1.available() > 0)
+                {
+                  char c = Serial1.read();
+                  if (c == '\n')
+                  {
+                    break;
+                  } else if (isDigit(c)) {
+                    dlsize += c;
+                  }
+                }
+              }
+              int idlsize = dlsize.toInt();
+              Serial.println(idlsize);
+              
+              client.println("HTTP/1.1 200 OK");
+              client.println("Content-type:binary/audio");
+              client.println("Content-Length: " + dlsize);
+              client.println("Accept-Ranges: bytes");
+              client.println("Connection: close");
+              client.println("");
+              
+              int count = 0;
+              int m = 0;
+              int timestamp = millis();
+              while(count < idlsize)
+              {
+                int left = idlsize - count;
+                int expected = (left > BUF_SIZE ? BUF_SIZE : left);
+                
+                int n = Serial1.available();
+                if (n > m)
+                {
+                  timestamp = millis();
+                  m = n;
+                }
+                
+                if (n == expected)
+                {                
+                  n = Serial1.readBytes(buf, n);
+                  Serial1.write(1);
+                  client.write(buf,n);
+                  count += n;
+                  Serial.print(count);
+                  Serial.print(", ");
+                  m = 0;
+                } 
+                else if (millis() - timestamp > 100)
+                {
+                  // Flush old data
+                  while(Serial1.available() > 0) {Serial1.read();}
+                  Serial1.write(0);
+                  Serial.println("Resend request");                  
+                }
+              }
+
+              Serial.println("Done");
+            } else {
+              bool printList = false;
+              
+              // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
+              // and a content-type so the client knows what's coming, then a blank line:
+              client.println("HTTP/1.1 200 OK");
+              client.println("Content-type:text/html");
+              client.println("Connection: close");
+              client.println();
+
+              // turns the GPIOs on and off
+              if (header.indexOf("GET /rec/on") >= 0 && boardState == "ready") {
+                Serial.println("Start Recording");
+                Serial1.println("start");
+                recordingState = "on";
+                delay(1000);
+                readMode();
+              } else if (header.indexOf("GET /rec/off") >= 0 && boardState == "recording") {
+                Serial.println("Stop Recording");
+                Serial1.println("stop");
+                recordingState = "off";
+                delay(1000);
+                readMode();
+              } else if (header.indexOf("GET /list") >= 0 && boardState == "ready") {
+                Serial.println("List");
+                printList = true;
+              } 
+
+              if(printList) 
+              {
+                // Flush old data
+                while(Serial1.available() > 0) {Serial1.read();}
+                
+                Serial1.println("list");
+              }
+
+              // Display the HTML web page
+              client.println("<!DOCTYPE html><html>");
+              client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
+              client.println("<link rel=\"icon\" href=\"data:,\">");
+              // CSS to style the on/off buttons
+              // Feel free to change the background-color and font-size attributes to fit your preferences
+              client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
+              client.println("a:link {text-decoration: none;}");
+              client.println(".button { background-color: white; border: none; color: red; padding: 16px 40px;");
+              client.println("text-decoration: none; font-size: 80px; margin: 2px; cursor: pointer;}");
+              client.println(".button2 {background-color: white; color: black;}");
+              client.println(".button4 {background-color: white; color: green;}");
+              client.println(".button3 {background-color: #white; color: black; font-size: 30px;}</style></head>");
+
+              // Web Page Heading
+              client.println("<body><h1>Audio Recording Headset</h1>");
+
+              // Display current state, and ON/OFF buttons for GPIO 26
+              client.println("<p>Headset is " + boardState + "</p>");
+              // If the recordingState is off, it displays the ON button
+              if (boardState == "ready") {
+                client.println("<p><a href=\"/rec/on\"><button class=\"button\">&#x25CF;</button></a></p>");
+              } else if (boardState == "recording") {
+                client.println("<p><a href=\"/rec/off\"><button class=\"button button2\">&#x25A0;</button></a></p>");
+              }
+              client.println("<p><a href=\"/\"><button class=\"button button4\">&#8635;</button></a></p>");
+              client.println("<p><a href=\"/list\"><button class=\"button button3\">List files</button></a></p>");
+
+              if (printList)
+              {
+                char c;
+                String filename = "";
+                while(true) {
+                  if (Serial1.available() > 0) 
+                  {
+                    c = Serial1.read();
+                    Serial.print(c);
+                    if ((char) c == '\n')
+                    {
+                      if (filename.length() == 0) {  Serial.println("Broken out"); break;}
+  
+                      String nameonly = filename.substring(0,filename.indexOf('\t'));
+                      String filesize = "\t" + filename.substring(filename.indexOf('\t')) + " kb";
+                      client.println("<p><a href=\"/dl/" + nameonly + "\">" + nameonly + "</a>" + filesize + "</p>");
+                      filename = "";
+                    } 
+                    else if (c != '\r')
+                    {
+                      filename += (char) c;
+                    }
+                  }
+                }
+              }
+              client.println("</body></html>");
+
+            }
+
+            // The HTTP response ends with another blank line
+            client.println();
+            client.println();
+            // Break out of the while loop
+            break;
+          } else { // if you got a newline, then clear currentLine
+            currentLine = "";
+          }
+        } else if (c != '\r') {  // if you got anything else but a carriage return character,
+          currentLine += c;      // add it to the end of the currentLine
+        }
+      }
+    }
+    // Clear the header variable
+    header = "";
+    // Close the connection
+    client.stop();
+    Serial.println("Client disconnected.");
+    Serial.println("");
+  }
+}
diff --git a/Code/Matlab/readData.m b/Code/Matlab/readData.m
new file mode 100644
index 0000000000000000000000000000000000000000..127714af4d3d9e2f2565ab4ecd90c6bdfe19ca76
--- /dev/null
+++ b/Code/Matlab/readData.m
@@ -0,0 +1,85 @@
+function [audio, data] = readData(name, path)
+%READDATA Read recorded sound and IMU data.
+% name    Name of files excluding extension
+% path    Path to read combined file from.
+
+%% Load sound
+filename = fullfile(path, [name '.wav']);
+
+[audio, fs] = audioread(filename);
+
+% Map channels to positions
+audio = audio(:,[5 7 4 1 2 3 8 6]);
+
+t = (1:size(audio,1))/fs*1000;
+figure; title('Microphone signals'); 
+for i=1:8;subplot(2,4,i); plot(t,audio(1:end,i));title(num2str(i));end
+
+%%
+ti = [650 71500];
+tc = t(t>= ti(1) & t <= ti(end));
+sndc = audio(t>= ti(1) & t <= ti(end),:);
+for i=1:8;subplot(2,4,i); plot(tc,sndc(1:end,i));title(num2str(i));end
+%% IMU Data
+filename = fullfile(path, [name '.bin']);
+
+% Load entire file first for faster parsing
+f = fopen(filename);
+D = uint8(fread(f, inf, 'uint8=>uint8')');
+fclose(f);
+
+% Init data structures for parsing
+struct_size = 64;
+N = length(D)/struct_size;
+timestamp = zeros(N,1);
+temperature = zeros(N,1);
+gyro = zeros(N,3);
+accelerometer = zeros(N,3);
+magnetometer = zeros(N,3);
+orientation = zeros(N,3);
+          
+% Parse data
+p = 1;
+for j = 1:N
+  if mod(j,500) == 0; clc; disp([num2str(round(j/N*100,0)) '%']); end
+  
+  timestamp(j,:) = typecast(D(p +(0:7)), 'uint64'); p = p + 8;
+  temperature(j,:) =  typecast(D(p +(0:3)), 'single'); p = p + 4;
+  gyro(j,:) = typecast(D(p +(0:11)), 'single'); p = p + 12;
+  accelerometer(j,:) = typecast(D(p +(0:11)), 'single'); p = p + 12;
+  magnetometer(j,:) = typecast(D(p +(0:11)), 'single'); p = p + 12;
+  orientation(j,:) = typecast(D(p +(0:11)), 'single'); p = p + 12;
+  p = p + 4; % Dummy
+end
+
+data = struct('Timestamp', timestamp, ...
+              'Temperature', temperature, ...
+              'Gyro', gyro, ...
+              'Accelerometer', accelerometer, ...
+              'Magnetometer', magnetometer, ...
+              'Orientation', orientation);
+
+% Sync with sound recording (hopefully not needed
+timestamp = timestamp - timestamp(1);
+
+% Remove outliers if missing data
+timestampf = filloutliers(timestamp,'linear','movmedian',1000);
+temperaturef = filloutliers(temperature,'linear','movmedian',1000);
+gyrof = filloutliers(gyro,'linear','movmedian',1000);
+accelerometerf = filloutliers(accelerometer,'linear','movmedian',1000);
+magnetometerf = filloutliers(magnetometer,'linear','movmedian',1000);
+orientationf = filloutliers(orientation,'linear','movmedian',1000);
+
+ %% Plot data
+
+figure; title('Raw')
+subplot(2,2,1); plot(timestamp/1000,orientation); title('Orientation'); xlabel('Time [s]'); ylabel('Attitude [deg]');
+subplot(2,2,2); plot(timestamp/1000,accelerometer); title('Accelerometer'); xlabel('Time [s]'); ylabel('Acceleration [g]');
+subplot(2,2,3); plot(timestamp/1000,magnetometer);title('Magnetometer'); xlabel('Time [s]'); ylabel('Magnetic Field [gauss]');
+subplot(2,2,4); plot(timestamp/1000,gyro);title('Gyro'); xlabel('Time [s]'); ylabel('Angular Velocity [deg/s]');
+
+figure;title('Outliers removed');
+subplot(2,2,1); plot(timestamp/1000,orientationf); title('Orientation'); xlabel('Time [s]'); ylabel('Attitude [deg]');
+subplot(2,2,2); plot(timestamp/1000,accelerometerf); title('Accelerometer');xlabel('Time [s]'); ylabel('Acceleration [g]');
+subplot(2,2,3); plot(timestamp/1000,magnetometerf);title('Magnetometer');xlabel('Time [s]'); ylabel('Magnetic Field [gauss]');
+subplot(2,2,4); plot(timestamp/1000,gyrof);title('Gyro'); xlabel('Time [s]'); ylabel('Angular Velocity [deg/s]');
\ No newline at end of file
diff --git a/Code/Matlab/splitFile.m b/Code/Matlab/splitFile.m
new file mode 100644
index 0000000000000000000000000000000000000000..19e2ddfd73223674c93b1d9f864e1784f60135ed
--- /dev/null
+++ b/Code/Matlab/splitFile.m
@@ -0,0 +1,110 @@
+function [audioBytes, dataBytes] = splitFile(name, outPath, inPath, magicWord, show)
+%SPLITFILE Splits a combined sound and data file, by searching for a magic
+%word that marks a data block and extract them into a separate file.
+% name      Name of file excluding extension
+% outPath   Path to place resulting wav and bin files
+% inPath    Path to read combined file from.
+% magicWord Determine magic word (default fe ed ab ee de ad)
+% show      Show progress in console (default true).
+
+if nargin < 5 || isempty(show); show = true; end
+  if nargin < 4 || isempty(magicWord) 
+    magicWord = hex2dec({'FE', 'ED', 'AB', 'EE', 'DE', 'AD'})'; %, 'BE', 'EF'
+  end
+  if nargin < 3 || isempty(inPath); inPath = 'E:\'; end
+  if nargin < 2 || isempty(outPath); outPath = 'D:\Data\AudioRecorder\'; end
+  
+  inFilename = fullfile(inPath,[name '.wav']);
+  outFilename = fullfile(outPath,[name '.wav']);
+  outData = fullfile(outPath,[name '.bin']);
+  i = 0;
+  while exist(outFilename, 'file') || exist(outData, 'file')
+    i = i + 1;
+    outFilename = fullfile(outPath,[name '_' num2str(i) '.wav']);
+    outData = fullfile(outPath,[name '_' num2str(i) '.bin']);
+  end
+  batchSize = 1024 * 1024;
+  sizeFieldSize = 2;
+  %frameSize = length(magicWord) + sizeFieldSize + structSize;
+  
+  fi = fopen(inFilename);
+  fa = fopen(outFilename, 'w');
+  fd = fopen(outData, 'w');
+  
+  totalBytes = dir(inFilename).bytes;
+  audioBytes = 0;
+  dataBytes = 0;
+  
+  D = [];
+  while(true)
+    if show
+        clc;
+        disp(['Processed: ' num2str(round((100*audioBytes+dataBytes)/totalBytes,1)) '%']);
+    end
+    
+    D = [D fread(fi, batchSize, 'uint8=>uint8')'];
+    
+    ind = strfind(D, magicWord);
+    
+    if isempty(ind)
+        fwrite(fa, D(1:end-length(magicWord)));
+        audioBytes = audioBytes + length(D(1:end-length(magicWord)));
+        D(1:end-length(magicWord)) = [];
+    else
+        p = 1;
+        for i = 1:length(ind)-1
+          fwrite(fa, D(p:ind(i)-1));      
+          audioBytes = audioBytes + length(D(p:ind(i)-1));
+          p = ind(i) + length(magicWord);
+
+          frame_size = sum(double(D([p p+1])).*[1 256]); 
+          p = p + sizeFieldSize;
+
+          fwrite(fd, D(p + (0:frame_size-1)));
+          dataBytes = dataBytes + frame_size;
+          p = p + frame_size;
+        end
+        fwrite(fa, D(p:ind(end)-1)); 
+        audioBytes = audioBytes + length(D(p:ind(end)-1));
+        p = ind(end);
+        
+        q = ind(end);
+        if length(D) - q > length(magicWord) + sizeFieldSize
+            q = q + length(magicWord);
+            frame_size = sum(double(D([q q+1])).*[1 256]); 
+            q = q + 2;
+            if length(D) - q > frame_size
+              fwrite(fd, D(q + (0:frame_size-1)));
+              dataBytes = dataBytes + frame_size;
+              p = q + frame_size;
+            else
+                D(1:p-1) = [];
+                continue;
+            end
+        else
+            D(1:p-1) = [];
+            continue;
+        end
+        if p < length(D) - length(magicWord) + 1 
+            fwrite(fa, D(p:end-length(magicWord)));
+            audioBytes = audioBytes + length(D(p:end-length(magicWord)));
+            
+            D(1:end-length(magicWord)) = [];
+        end
+    end
+    if feof(fi) == 1
+        fwrite(fa, D);
+        audioBytes = audioBytes + length(D);
+        D = [];
+        if show
+            clc;
+            disp(['Processed: 100%']);
+        end
+        break;
+    end
+  end
+  fclose(fi);
+  fclose(fa);
+  fclose(fd);
+end
+
diff --git a/Code/README.MD b/Code/README.MD
new file mode 100644
index 0000000000000000000000000000000000000000..11369e0c5685c935cea23b20b095dcfdb1f6ccd8
--- /dev/null
+++ b/Code/README.MD
@@ -0,0 +1,27 @@
+Array Frame Source Code
+=======================
+
+The main code executes on the Spresense board. 
+Recordings are started and stopped using a push button and the resulting files are stored on an SD card.
+
+Optionally, an AdaFruit HUZZAH32 board can be used to manage recordings over WiFi.
+
+Preparations
+------------
+1. Install Arduino IDE for Spresense using the guide
+https://developer.sony.com/develop/spresense/docs/arduino_set_up_en.html
+
+2. Open the Library Manager in Arduino IDE and install
+     - Sparkfun MPU-9250 9 DOF IMU Breakout
+     - SoftwareWire
+3. Replace SoftwareWire files with the modified files in this repo to make it compatible with Spresense.
+4. Update the MPU-9250 code to include SoftwareWire.h instead of Wire.h and replace TwoWire with SoftwareWire.
+
+Optional WebServer
+------------------
+Install ESP32 library using the guide
+https://learn.adafruit.com/huzzah32-esp32-breakout-board/using-with-arduino-ide
+
+Data Parsing
+------------
+To parse the data, an m-script (splitFile.m) is provided for splitting the recorded file into a sound file and a data file. Another script (readData.m) is provided to parse the data into matlab.
\ No newline at end of file
diff --git a/Code/SoftwareWire/Licence.md b/Code/SoftwareWire/Licence.md
new file mode 100644
index 0000000000000000000000000000000000000000..5f8b06fe3c76799cc5db75f8283f6417cb20b80a
--- /dev/null
+++ b/Code/SoftwareWire/Licence.md
@@ -0,0 +1,675 @@
+### GNU GENERAL PUBLIC LICENSE
+
+Version 3, 29 June 2007
+
+Copyright (C) 2007 Free Software Foundation, Inc.
+<http://fsf.org/>
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+### Preamble
+
+The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works. By contrast,
+the GNU General Public License is intended to guarantee your freedom
+to share and change all versions of a program--to make sure it remains
+free software for all its users. We, the Free Software Foundation, use
+the GNU General Public License for most of our software; it applies
+also to any other work released this way by its authors. You can apply
+it to your programs, too.
+
+When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights. Therefore, you
+have certain responsibilities if you distribute copies of the
+software, or if you modify it: responsibilities to respect the freedom
+of others.
+
+For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received. You must make sure that they, too, receive
+or can get the source code. And you must show them these terms so they
+know their rights.
+
+Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software. For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the
+manufacturer can do so. This is fundamentally incompatible with the
+aim of protecting users' freedom to change the software. The
+systematic pattern of such abuse occurs in the area of products for
+individuals to use, which is precisely where it is most unacceptable.
+Therefore, we have designed this version of the GPL to prohibit the
+practice for those products. If such problems arise substantially in
+other domains, we stand ready to extend this provision to those
+domains in future versions of the GPL, as needed to protect the
+freedom of users.
+
+Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish
+to avoid the special danger that patents applied to a free program
+could make it effectively proprietary. To prevent this, the GPL
+assures that patents cannot be used to render the program non-free.
+
+The precise terms and conditions for copying, distribution and
+modification follow.
+
+### TERMS AND CONDITIONS
+
+#### 0. Definitions.
+
+"This License" refers to version 3 of the GNU General Public License.
+
+"Copyright" also means copyright-like laws that apply to other kinds
+of works, such as semiconductor masks.
+
+"The Program" refers to any copyrightable work licensed under this
+License. Each licensee is addressed as "you". "Licensees" and
+"recipients" may be individuals or organizations.
+
+To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of
+an exact copy. The resulting work is called a "modified version" of
+the earlier work or a work "based on" the earlier work.
+
+A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy. Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies. Mere interaction with a user
+through a computer network, with no transfer of a copy, is not
+conveying.
+
+An interactive user interface displays "Appropriate Legal Notices" to
+the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License. If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+#### 1. Source Code.
+
+The "source code" for a work means the preferred form of the work for
+making modifications to it. "Object code" means any non-source form of
+a work.
+
+A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form. A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities. However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work. For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+The Corresponding Source need not include anything that users can
+regenerate automatically from other parts of the Corresponding Source.
+
+The Corresponding Source for a work in source code form is that same
+work.
+
+#### 2. Basic Permissions.
+
+All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met. This License explicitly affirms your unlimited
+permission to run the unmodified Program. The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work. This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+You may make, run and propagate covered works that you do not convey,
+without conditions so long as your license otherwise remains in force.
+You may convey covered works to others for the sole purpose of having
+them make modifications exclusively for you, or provide you with
+facilities for running those works, provided that you comply with the
+terms of this License in conveying all material for which you do not
+control copyright. Those thus making or running the covered works for
+you must do so exclusively on your behalf, under your direction and
+control, on terms that prohibit them from making any copies of your
+copyrighted material outside their relationship with you.
+
+Conveying under any other circumstances is permitted solely under the
+conditions stated below. Sublicensing is not allowed; section 10 makes
+it unnecessary.
+
+#### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such
+circumvention is effected by exercising rights under this License with
+respect to the covered work, and you disclaim any intention to limit
+operation or modification of the work as a means of enforcing, against
+the work's users, your or third parties' legal rights to forbid
+circumvention of technological measures.
+
+#### 4. Conveying Verbatim Copies.
+
+You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+#### 5. Conveying Modified Source Versions.
+
+You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these
+conditions:
+
+-   a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+-   b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under
+    section 7. This requirement modifies the requirement in section 4
+    to "keep intact all notices".
+-   c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy. This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged. This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+-   d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit. Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+#### 6. Conveying Non-Source Forms.
+
+You may convey a covered work in object code form under the terms of
+sections 4 and 5, provided that you also convey the machine-readable
+Corresponding Source under the terms of this License, in one of these
+ways:
+
+-   a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+-   b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the Corresponding
+    Source from a network server at no charge.
+-   c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source. This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+-   d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge. You need not require recipients to copy the
+    Corresponding Source along with the object code. If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source. Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+-   e) Convey the object code using peer-to-peer transmission,
+    provided you inform other peers where the object code and
+    Corresponding Source of the work are being offered to the general
+    public at no charge under subsection 6d.
+
+A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal,
+family, or household purposes, or (2) anything designed or sold for
+incorporation into a dwelling. In determining whether a product is a
+consumer product, doubtful cases shall be resolved in favor of
+coverage. For a particular product received by a particular user,
+"normally used" refers to a typical or common use of that class of
+product, regardless of the status of the particular user or of the way
+in which the particular user actually uses, or expects or is expected
+to use, the product. A product is a consumer product regardless of
+whether the product has substantial commercial, industrial or
+non-consumer uses, unless such uses represent the only significant
+mode of use of the product.
+
+"Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to
+install and execute modified versions of a covered work in that User
+Product from a modified version of its Corresponding Source. The
+information must suffice to ensure that the continued functioning of
+the modified object code is in no case prevented or interfered with
+solely because modification has been made.
+
+If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information. But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or
+updates for a work that has been modified or installed by the
+recipient, or for the User Product in which it has been modified or
+installed. Access to a network may be denied when the modification
+itself materially and adversely affects the operation of the network
+or violates the rules and protocols for communication across the
+network.
+
+Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+#### 7. Additional Terms.
+
+"Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law. If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it. (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.) You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders
+of that material) supplement the terms of this License with terms:
+
+-   a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+-   b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+-   c) Prohibiting misrepresentation of the origin of that material,
+    or requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+-   d) Limiting the use for publicity purposes of names of licensors
+    or authors of the material; or
+-   e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+-   f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions
+    of it) with contractual assumptions of liability to the recipient,
+    for any liability that these contractual assumptions directly
+    impose on those licensors and authors.
+
+All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10. If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term. If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions; the
+above requirements apply either way.
+
+#### 8. Termination.
+
+You may not propagate or modify a covered work except as expressly
+provided under this License. Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+However, if you cease all violation of this License, then your license
+from a particular copyright holder is reinstated (a) provisionally,
+unless and until the copyright holder explicitly and finally
+terminates your license, and (b) permanently, if the copyright holder
+fails to notify you of the violation by some reasonable means prior to
+60 days after the cessation.
+
+Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License. If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+#### 9. Acceptance Not Required for Having Copies.
+
+You are not required to accept this License in order to receive or run
+a copy of the Program. Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance. However,
+nothing other than this License grants you permission to propagate or
+modify any covered work. These actions infringe copyright if you do
+not accept this License. Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+#### 10. Automatic Licensing of Downstream Recipients.
+
+Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License. You are not responsible
+for enforcing compliance by third parties with this License.
+
+An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations. If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License. For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+#### 11. Patents.
+
+A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based. The
+work thus licensed is called the contributor's "contributor version".
+
+A contributor's "essential patent claims" are all patent claims owned
+or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version. For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement). To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients. "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+A patent license is "discriminatory" if it does not include within the
+scope of its coverage, prohibits the exercise of, or is conditioned on
+the non-exercise of one or more of the rights that are specifically
+granted under this License. You may not convey a covered work if you
+are a party to an arrangement with a third party that is in the
+business of distributing software, under which you make payment to the
+third party based on the extent of your activity of conveying the
+work, and under which the third party grants, to any of the parties
+who would receive the covered work from you, a discriminatory patent
+license (a) in connection with copies of the covered work conveyed by
+you (or copies made from those copies), or (b) primarily for and in
+connection with specific products or compilations that contain the
+covered work, unless you entered into that arrangement, or that patent
+license was granted, prior to 28 March 2007.
+
+Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+#### 12. No Surrender of Others' Freedom.
+
+If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under
+this License and any other pertinent obligations, then as a
+consequence you may not convey it at all. For example, if you agree to
+terms that obligate you to collect a royalty for further conveying
+from those to whom you convey the Program, the only way you could
+satisfy both those terms and this License would be to refrain entirely
+from conveying the Program.
+
+#### 13. Use with the GNU Affero General Public License.
+
+Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work. The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+#### 14. Revised Versions of this License.
+
+The Free Software Foundation may publish revised and/or new versions
+of the GNU General Public License from time to time. Such new versions
+will be similar in spirit to the present version, but may differ in
+detail to address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies that a certain numbered version of the GNU General Public
+License "or any later version" applies to it, you have the option of
+following the terms and conditions either of that numbered version or
+of any later version published by the Free Software Foundation. If the
+Program does not specify a version number of the GNU General Public
+License, you may choose any version ever published by the Free
+Software Foundation.
+
+If the Program specifies that a proxy can decide which future versions
+of the GNU General Public License can be used, that proxy's public
+statement of acceptance of a version permanently authorizes you to
+choose that version for the Program.
+
+Later license versions may give you additional or different
+permissions. However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+#### 15. Disclaimer of Warranty.
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
+WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
+PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
+DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
+CORRECTION.
+
+#### 16. Limitation of Liability.
+
+IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR
+CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
+ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
+NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR
+LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
+TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
+PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
+
+#### 17. Interpretation of Sections 15 and 16.
+
+If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+END OF TERMS AND CONDITIONS
+
+### How to Apply These Terms to Your New Programs
+
+If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these
+terms.
+
+To do so, attach the following notices to the program. It is safest to
+attach them to the start of each source file to most effectively state
+the exclusion of warranty; and each file should have at least the
+"copyright" line and a pointer to where the full notice is found.
+
+        <one line to give the program's name and a brief idea of what it does.>
+        Copyright (C) <year>  <name of author>
+
+        This program is free software: you can redistribute it and/or modify
+        it under the terms of the GNU General Public License as published by
+        the Free Software Foundation, either version 3 of the License, or
+        (at your option) any later version.
+
+        This program is distributed in the hope that it will be useful,
+        but WITHOUT ANY WARRANTY; without even the implied warranty of
+        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+        GNU General Public License for more details.
+
+        You should have received a copy of the GNU General Public License
+        along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper
+mail.
+
+If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+        <program>  Copyright (C) <year>  <name of author>
+        This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+        This is free software, and you are welcome to redistribute it
+        under certain conditions; type `show c' for details.
+
+The hypothetical commands \`show w' and \`show c' should show the
+appropriate parts of the General Public License. Of course, your
+program's commands might be different; for a GUI interface, you would
+use an "about box".
+
+You should also get your employer (if you work as a programmer) or
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. For more information on this, and how to apply and follow
+the GNU GPL, see <http://www.gnu.org/licenses/>.
+
+The GNU General Public License does not permit incorporating your
+program into proprietary programs. If your program is a subroutine
+library, you may consider it more useful to permit linking proprietary
+applications with the library. If this is what you want to do, use the
+GNU Lesser General Public License instead of this License. But first,
+please read <http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Code/SoftwareWire/SoftwareWire.cpp b/Code/SoftwareWire/SoftwareWire.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..42db261011ea3f79d1dba33da7c01ea097a1865a
--- /dev/null
+++ b/Code/SoftwareWire/SoftwareWire.cpp
@@ -0,0 +1,890 @@
+// Signal differences
+// ------------------
+//    When the AVR microcontroller is set into hardware I2C mode,
+//    the pins follow the I2C specifications for voltage levels and current.
+//    For example the current to pull SDA or SCL low is maximum 3mA.
+//
+//    With the Software I2C, a normal pin is used which can sink/source 40mA for a ATmega328P.
+//    That could increase the voltage spikes and could increase interference between sda and scl.
+//    The voltage levels are different.
+//    The timing of the software I2C is also different.
+//
+//    In most cases the software I2C should work.
+//    With longer wires or with non-matching voltage levels, the result is unpredictable.
+//
+//
+//
+// Clock pulse stretching
+// ----------------------
+//    An I2C Slave could stretch the clock signal by keeping the SCL low.
+//    This happens for example when a Slave is an Arduino which can be
+//    busy doing other things like handling other interrupts.
+//    Adding a check for the clock stretching should make the transmission
+//    completely reliable without any loss.
+//    Only an Arduino as Slave would do clock stretching, normal devices
+//    like sensors and I2C EEPROM don't use clock stretching.
+//    The extra check for clock stretching slows down the transfer rate.
+//
+//    Using millis() instead of micros() is faster.
+//    That is why millis() is used for the timeout of the clock pulse stretching.
+//
+//
+//
+// Arduino Stream class
+// --------------------
+//    The Arduino Stream class is used by many Arduino objects.
+//    For the I2C bus, the benefits are less obvious.
+//    For example the parseInt() function is not used with I2C.
+//    At this moment the Stream class is not used.
+//
+//
+// Multiple Slaves with the same I2C address
+// -----------------------------------------
+//    The SoftwareWire can be declared more than once,
+//    to create a number of software i2c busses.
+//    That makes it possible to use a number of I2C devices,
+//    which have the same I2C address.
+//    Every software i2c bus requires 2 pins,
+//    and every SoftwareWire object requires 59 bytes at the moment.
+//
+
+
+
+//  added code to i2c_stop(), since a problem was reported here:
+//  http://forum.arduino.cc/index.php?topic=348337.0
+//  Added lines have keyword "ADDED1".
+
+
+// Use the next define to run a i2c_scanner inside the printStatus() function.
+// #define ENABLE_I2C_SCANNER
+
+#include "SoftwareWire.h"
+
+#include "Arduino.h"
+
+
+// Sets SDA low and drives output.
+// The SDA may not be HIGH output, so first the output register is cleared
+// (clearing internal pullup resistor), after that the SDA is set as output.
+//#define i2c_sda_lo()              \
+//  *_sdaPortReg &= ~_sdaBitMask;   \
+//  *_sdaDirReg  |=  _sdaBitMask;
+#define i2c_sda_lo()              \
+  digitalWrite(_sdaPin, LOW);
+
+
+// sets SCL low and drives output.
+// The SCL may not be HIGH output, so first the output register is cleared
+// (clearing internal pullup resistor), after that the SCL is set as output.
+//#define i2c_scl_lo()              \
+//  *_sclPortReg &= ~_sclBitMask;   \
+//  *_sclDirReg  |=  _sclBitMask;
+#define i2c_scl_lo()              \
+  digitalWrite(_sclPin, LOW);   
+
+// Set SDA high and to input (releases pin) (i.e. change to input, turn on pullup).
+// The SDA may not become HIGH output. Therefore the pin is first set to input,
+// after that, a pullup resistor is switched on if needed.
+// #define i2c_sda_hi()              \
+  // *_sdaDirReg &= ~_sdaBitMask;    \
+  // if(_pullups) { *_sdaPortReg |= _sdaBitMask; }
+// #define i2c_sda_hi()              \
+  // pinMode(_sdaPin, INPUT);    \
+  // if(_pullups) { pinMode(_sdaPin, INPUT_PULLUP); }
+#define i2c_sda_hi()              \
+  pinMode(_sdaPin, INPUT_PULLUP);
+  
+// set SCL high and to input (releases pin) (i.e. change to input, turn on pullup)
+// The SCL may not become HIGH output. Therefore the pin is first set to input,
+// after that, a pullup resistor is switched on if needed.
+// #define i2c_scl_hi()              \
+  // *_sclDirReg &= ~_sclBitMask;    \
+  // if(_pullups) { *_sclPortReg |= _sclBitMask; }
+// #define i2c_scl_hi()              \
+  // pinMode(_sclPin, INPUT);    \
+  // if(_pullups) { pinMode(_sclPin, INPUT_PULLUP);}
+#define i2c_scl_hi()              \
+  pinMode(_sclPin, INPUT_PULLUP);
+  
+// Read the bit value of the pin
+// Note that is the pin can also be read when it is an output.
+// #define i2c_sda_read()   ((uint8_t) (*_sdaPinReg & _sdaBitMask) ? 1 : 0)
+// #define i2c_scl_read()   ((uint8_t) (*_sclPinReg & _sclBitMask) ? 1 : 0)
+#define i2c_sda_read()   ((uint8_t) digitalRead(_sdaPin))
+#define i2c_scl_read()   ((uint8_t) digitalRead(_sclPin))
+
+
+//
+// Constructor
+//
+// The pins are not activated until begin() is called.
+//
+SoftwareWire::SoftwareWire()
+{
+}
+
+SoftwareWire::SoftwareWire(uint8_t sdaPin, uint8_t sclPin, boolean pullups, boolean detectClockStretch)
+{
+	
+  _sdaPin = sdaPin;
+  _sclPin = sclPin;
+  _pullups = pullups;
+  _stretch = detectClockStretch;
+
+  setClock( 100000UL);       // set default 100kHz
+
+  // Set default timeout to 1000 ms.
+  // 1 second is very long, 10ms would be more appropriate.
+  // However, the Arduino libraries use often a default timeout of 1 second.
+  setTimeout( 1000L);
+
+  // Turn Arduino pin numbers into PORTx, DDRx, and PINx
+  // uint8_t port;
+
+  // port = digitalPinToPort(_sdaPin);
+  // _sdaBitMask  = digitalPinToBitMask(_sdaPin);
+  // _sdaPortReg  = portOutputRegister(port);
+  // _sdaDirReg   = portModeRegister(port);
+  // _sdaPinReg   = portInputRegister(port);      // PinReg is the input register, not the Arduino pin.
+
+  // port = digitalPinToPort(_sclPin);
+  // _sclBitMask  = digitalPinToBitMask(_sclPin);
+  // _sclPortReg  = portOutputRegister(port);
+  // _sclDirReg   = portModeRegister(port);
+  // _sclPinReg   = portInputRegister(port);
+}
+
+
+//
+// The destructor releases the pins Software I2C bus for other use.
+//
+SoftwareWire::~SoftwareWire()
+{
+  end();
+}
+
+
+//
+// Release the pins of the Software I2C bus for other use.
+// Also the internal pullup resistors are removed.
+//
+void SoftwareWire::end()
+{
+  // Remember the pullups variable.
+  // They will be used again when begin() is called.
+  boolean pullupsCopy = _pullups;
+
+  _pullups = false;
+  i2c_sda_hi();          // release sda, remove any pullup
+  i2c_scl_hi();          // release scl, remove any pullup
+
+  _pullups = pullupsCopy;
+}
+
+
+// begin(void) - enter master mode
+// The pins are not changed until begin() is called.
+void SoftwareWire::begin(void)
+{
+  rxBufPut = 0;          // nothing in the rxBuf
+  rxBufGet = 0;
+
+  i2c_init();            // release the sda and scl (the pullup resistors pull them high)
+
+  // Some tests could be added here, to check if the SDA and SCL are really turning high.
+  // Even some tests for shortcuts could be done here.
+
+
+  // When a I2C transmission would start immediate, it could fail when only the internal pullup resistors
+  // are used, and the signals were just now turned high with i2c_init().
+  if( _pullups)
+    delay(2);           // 1ms didn't always work.
+}
+
+//
+// beginTransmission starts the I2C transmission immediate.
+//
+void SoftwareWire::beginTransmission(uint8_t address)
+{
+  // Reset error returned by endTransmission.
+  _transmission = SOFTWAREWIRE_NO_ERROR;
+
+  // check return value of the start condition.
+  // It indicates if the i2c bus is okay.
+  if(i2c_start())
+  {
+    uint8_t rc = i2c_write((address << 1) | 0);       // The r/w bit is zero for write
+
+    if( rc == 0)                                      // a sda zero from Slave for the 9th bit is ack
+    {
+      _transmission = SOFTWAREWIRE_NO_ERROR;
+    }
+    else
+    {
+      _transmission = SOFTWAREWIRE_ADDRESS_NACK;
+    }
+  }
+  else
+  {
+    // If the bus was not okay, the scl or sda didn't work.
+    _transmission = SOFTWAREWIRE_OTHER;
+  }
+}
+
+
+//
+void SoftwareWire::beginTransmission(int address)
+{
+  beginTransmission((uint8_t)address);
+}
+
+
+//
+uint8_t SoftwareWire::endTransmission(boolean sendStop)
+{
+  if(sendStop)
+    i2c_stop();
+  else
+    i2c_repstart();
+
+  return(_transmission);          // return the transmission status that was set during writing address and data
+}
+
+
+//
+// The requestFrom() read the data from the I2C bus and stores it in a buffer.
+//
+uint8_t SoftwareWire::requestFrom(uint8_t address, uint8_t size, uint8_t sendStop)
+{
+  uint8_t n=0;             // number of valid received bytes. Start with 0 bytes.
+
+  // The transmission status is set, although it is not returned.
+  // Start with the status : no error
+  _transmission = SOFTWAREWIRE_NO_ERROR;
+
+
+  // Clear the RX buffer
+  rxBufPut = 0;
+  rxBufGet = 0;
+
+  boolean bus_okay = i2c_start();
+
+  if(bus_okay)
+  {
+    uint8_t rc = i2c_write((address << 1) | 1);          // The r/w bit is '1' to read
+
+    if( rc == 0)                                         // a sda zero from Slave for the 9th bit is ack
+    {
+      _transmission = SOFTWAREWIRE_NO_ERROR;
+
+      // TODO: check if the Slave returns less bytes than requested.
+
+      for(; n<size; n++)
+      {
+        if( n < (size - 1))
+          rxBuf[n] = i2c_read(true);        // read with ack
+        else
+          rxBuf[n] = i2c_read(false);       // last byte, read with nack
+      }
+      rxBufPut = n;
+    }
+    else
+    {
+      _transmission = SOFTWAREWIRE_ADDRESS_NACK;
+    }
+  }
+  else
+  {
+    // There was a bus error.
+    _transmission = SOFTWAREWIRE_OTHER;
+  }
+
+  if(sendStop > 0 || _transmission != SOFTWAREWIRE_NO_ERROR)
+    i2c_stop();
+  else
+    i2c_repstart();
+
+  return( n);
+}
+
+
+//
+// uint8_t SoftwareWire::requestFrom(int address, int size, int sendStop)
+// {
+  // return requestFrom( (uint8_t) address, (uint8_t) size, (uint8_t) sendStop);
+// }
+
+
+// must be called in:
+// slave tx event callback
+// or after beginTransmission(address)
+size_t SoftwareWire::write(uint8_t data)
+{
+  // When there was an error during the transmission, no more bytes are transmitted.
+  if( _transmission == SOFTWAREWIRE_NO_ERROR)
+  {
+    if( i2c_write(data) == 0)                // a sda zero from Slave for the 9th bit is ack
+    {
+      _transmission = SOFTWAREWIRE_NO_ERROR;
+    }
+    else
+    {
+      _transmission = SOFTWAREWIRE_ADDRESS_NACK;
+    }
+  }
+
+  return(1);             // ignore any errors, return the number of bytes that are written.
+}
+
+
+//
+size_t SoftwareWire::write(const uint8_t* data, size_t quantity)
+{
+  for (size_t i=0; i<quantity; i++)
+  {
+    write(data[i]);
+  }
+
+  return(quantity);          // ignore any errors, return the number of bytes that are written.
+}
+
+
+//
+int SoftwareWire::available(void)
+{
+  return(rxBufPut - rxBufGet);
+}
+
+
+//
+int SoftwareWire::peek(void)
+{
+  int data;
+
+  if( rxBufPut > rxBufGet)
+  {
+    data = rxBuf[rxBufGet];
+  }
+  else
+  {
+    data = -1;
+  }
+
+  return(data);
+}
+
+
+//
+// The read() reads the buffer, not the I2C bus.
+//
+int SoftwareWire::read(void)
+{
+  int data;
+
+  if( rxBufPut > rxBufGet)
+  {
+    data = rxBuf[rxBufGet];
+    rxBufGet++;
+  }
+  else
+  {
+    data = -1;
+  }
+
+  return(data);
+}
+
+
+int SoftwareWire::readBytes(uint8_t* buf, uint8_t size)
+{
+  int data;
+  int n;
+
+  for( n=0; n<size; n++)
+  {
+    data = read();
+    if( data == -1)
+      break;
+    else
+      buf[n] = (uint8_t) data;
+  }
+
+  return(n);
+}
+
+
+//
+int SoftwareWire::readBytes(char * buf, uint8_t size)
+{
+  return readBytes( (uint8_t *) buf, size);
+}
+
+
+//
+int SoftwareWire::readBytes(char * buf, int size)
+{
+  return readBytes( (uint8_t *) buf, (uint8_t) size);
+}
+
+
+//
+// Set the clock speed for the I2C bus.
+// Default is 100000 (100kHz).
+// A speed of 1Hz is possible with this software I2C library (but not with the Arduino Wire library).
+// A speed of 200kHz or higher will remove the delay on an Arduino Uno.
+// Without the delay, the functions are free running, using the execution timing of the code.
+//
+void SoftwareWire::setClock(uint32_t clock)
+{
+  // Tested values with an earlier version of this library.
+  //   Value 0 is without delay, the result depends on the microcontroller and the cpu clock.
+  //   0=maxspeed=140kHz (tested on 328P@16MHz)
+  //   1=120kHz
+  //   2=100kHz (default)
+  //   7=50kHz
+  //   47=10kHz
+  //   97=5kHz
+  //   500=1kHz
+  //   5000=100Hz
+  //   16383=minspeed=30Hz  - delayMicroseconds() max value reference arduino
+  //
+
+  _i2cdelay = 2;
+  return;
+  
+  // The _i2cdelay is an uint16_t
+  _i2cdelay = ( (F_CPU / 32L) / clock );               // The delay in microseconds, '32' is for this code.
+  unsigned int delayByCode = (F_CPU / 5000000L);       // Add some delay for the code, just a guess
+
+  if( _i2cdelay > delayByCode)
+    _i2cdelay -= delayByCode;
+  else
+    _i2cdelay = 0;
+
+}
+
+
+//
+// Set the timeout in milliseconds.
+// At this moment, it is only used for timeout when the Slave is stretching the clock pulse.
+//
+void SoftwareWire::setTimeout(long timeout)
+{
+  // 2017, fix issue #6.
+  // A signed long as parameter to be compatible with Arduino libraries.
+  // A unsigned long internal to avoid compiler warnings.
+  _timeout = (unsigned long) timeout;
+}
+
+
+// printStatus
+// -----------
+// Print information to the Serial port
+// Used during developing and debugging.
+// Call it with the Serial port as parameter:
+//   myWire.printStatus(Serial);
+// This function is not compatible with the Wire library.
+// When this function is not called, it does not use any memory.
+//
+void SoftwareWire::printStatus( Print& Ser)
+{
+  Ser.println(F("-------------------"));
+  Ser.println(F("SoftwareWire Status"));
+  Ser.println(F("-------------------"));
+  Ser.print(F("  F_CPU = "));
+  Ser.println(F_CPU);
+  Ser.print(F("  sizeof(SoftwareWire) = "));
+  Ser.println(sizeof(SoftwareWire));
+  Ser.print(F("  _transmission status = "));
+  Ser.println(_transmission);
+  Ser.print(F("  _i2cdelay = "));
+  Ser.print(_i2cdelay);
+  if( _i2cdelay == 0)
+    Ser.print(F(" (free running)"));
+  Ser.println();
+  Ser.print(F("  _pullups = "));
+  Ser.print(_pullups);
+  if( _pullups)
+    Ser.print(F(" (enabled)"));
+  Ser.println();
+  Ser.print(F("  _timeout = "));
+  Ser.print(_timeout);
+  Ser.println(F(" ms"));
+
+  Ser.print(F("  SOFTWAREWIRE_BUFSIZE = "));
+  Ser.println(SOFTWAREWIRE_BUFSIZE);
+  Ser.print(F("  rxBufPut = "));
+  Ser.println(rxBufPut);
+  Ser.print(F("  rxBufGet = "));
+  Ser.println(rxBufGet);
+  Ser.print(F("  available() = "));
+  Ser.println(available());
+  Ser.print(F("  rxBuf (hex) = "));
+  for(int ii=0; ii<SOFTWAREWIRE_BUFSIZE; ii++)
+  {
+    if(rxBuf[ii] < 16)
+      Ser.print(F("0"));
+    Ser.print(rxBuf[ii],HEX);
+    Ser.print(F(" "));
+  }
+  Ser.println();
+
+  // Ser.print(F("  _sdaPin = "));
+  // Ser.println(_sdaPin);
+  // Ser.print(F("  _sclPin = "));
+  // Ser.println(_sclPin);
+  // Ser.print(F("  _sdaBitMask = 0x"));
+  // Ser.println(_sdaBitMask, HEX);
+  // Ser.print(F("  _sclBitMask = 0x"));
+  // Ser.println(_sclBitMask, HEX);
+  // Ser.print(F("  _sdaPortReg = "));
+  // Ser.println( (uint16_t) _sdaPortReg, HEX);
+  // Ser.print(F("  _sclPortReg = "));
+  // Ser.println( (uint16_t) _sclPortReg, HEX);
+  // Ser.print(F("  _sdaDirReg = "));
+  // Ser.println( (uint16_t) _sdaDirReg, HEX);
+  // Ser.print(F("  _sclDirReg = "));
+  // Ser.println( (uint16_t) _sclDirReg, HEX);
+  // Ser.print(F("  _sdaPinReg = "));
+  // Ser.println( (uint16_t) _sdaPinReg, HEX);
+  // Ser.print(F("  _sclPinReg = "));
+  // Ser.println( (uint16_t) _sclPinReg, HEX);
+
+  Ser.print(F("  line state sda = "));
+  Ser.println(i2c_sda_read());
+  Ser.print(F("  line state scl = "));
+  Ser.println(i2c_scl_read());
+
+#ifdef ENABLE_I2C_SCANNER
+  // i2c_scanner
+  // Taken from : http://playground.arduino.cc/Main/I2cScanner
+  // At April 2015, it was version 5
+  Ser.println("\n  I2C Scanner");
+  byte error, address;
+  int nDevices;
+
+  Ser.println("  Scanning...");
+
+  nDevices = 0;
+  for(address=1; address<127; address++ )
+  {
+    // The i2c_scanner uses the return value of
+    // the Write.endTransmisstion to see if
+    // a device did acknowledge to the address.
+    beginTransmission(address);
+    error = endTransmission();
+
+    if (error == 0)
+    {
+      Ser.print("  I2C device found at address 0x");
+      if (address<16)
+        Ser.print("0");
+      Ser.print(address,HEX);
+      Ser.println("  !");
+
+      nDevices++;
+    }
+    else if (error==4)
+    {
+      Ser.print("  Unknow error at address 0x");
+      if (address<16)
+        Ser.print("0");
+      Ser.println(address,HEX);
+    }
+  }
+  if (nDevices == 0)
+    Ser.println("  No I2C devices found\n");
+  else
+    Ser.println("  done\n");
+#endif
+}
+
+
+//--------------------------------------------------------------------
+
+
+//
+// The i2c_writebit and i2c_readbit could be make "inline", but that
+// didn't increase the speed, and the code size increases.
+//
+// The sda is low after the start condition.
+// Therefore the sda is low for the first bit.
+//
+void SoftwareWire::i2c_writebit(uint8_t c)
+{
+  if(c==0)
+  {
+    i2c_sda_lo();
+  }
+  else
+  {
+    i2c_sda_hi();
+  }
+
+  if (_i2cdelay != 0)               // This delay is not needed, but it makes it safer
+    delayMicroseconds(_i2cdelay);   // This delay is not needed, but it makes it safer
+
+  i2c_scl_hi();                     // clock high: the Slave will read the sda signal
+
+  // Check if clock stretching by the Slave should be detected.
+  if( _stretch)
+  {
+    // If the Slave was stretching the clock pulse, the clock would not go high immediately.
+    // For example if the Slave is an Arduino, that has other interrupts running (for example Serial data).
+    unsigned long prevMillis = millis();
+    while( i2c_scl_read() == 0)
+    {
+      if( millis() - prevMillis >= _timeout)
+        break;
+    };
+  }
+
+  // After the clock stretching, the clock must be high for the normal duration.
+  // That is why this delay has still to be done.
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  i2c_scl_lo();
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+}
+
+
+//
+uint8_t SoftwareWire::i2c_readbit(void)
+{
+  i2c_sda_hi();            // 'hi' is the same as releasing the line
+  i2c_scl_hi();
+
+  // Check if clock stretching by the Slave should be detected.
+  if( _stretch)
+  {
+    // Wait until the clock is high, the Slave could keep it low for clock stretching.
+    unsigned long prevMillis = millis();
+    while( i2c_scl_read() == 0)
+    {
+      if( millis() - prevMillis >= _timeout)
+        break;
+    };
+  }
+
+  // After the clock stretching, this delay has still be done before reading sda.
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  uint8_t c = i2c_sda_read();
+
+  i2c_scl_lo();
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  return(c);
+}
+
+
+//
+// Initializes the Software I2C.
+//
+// The original i2c_init sets the SDA and SCL high at the same time.
+//
+// The code has been changed, since the first data to the software i2c did fail sometimes.
+// Changed into SCL high first, with a delay.
+// That would send a STOP if the SDA happens to be low.
+// Any Slave that was busy, will detect the STOP.
+//
+// After both lines are high, the delay is changed into 4 times the normal delay.
+// That did reduce the error with the first transmission.
+// It was tested with Arduino Uno with clock of 100kHz (_i2cdelay=2).
+//
+void SoftwareWire::i2c_init(void)
+{
+  i2c_scl_hi();
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  i2c_sda_hi();
+
+  for( uint8_t i=0; i<4; i++)             // 4 times the normal delay, to claim the bus.
+  {
+    if (_i2cdelay != 0)
+      delayMicroseconds(_i2cdelay);
+  }
+}
+
+
+//
+// Send a START Condition
+//
+// The SDA and SCL should already be high.
+//
+// The SDA and SCL will both be low after this function.
+// When writing the address, the Master makes them high.
+//
+// Return value:
+//   true  : software i2c bus is okay.
+//   false : failed, some kind of hardware bus error.
+//
+boolean SoftwareWire::i2c_start(void)
+{
+  i2c_sda_hi();              // can perhaps be removed some day ? if the rest of the code is okay
+  i2c_scl_hi();              // can perhaps be removed some day ? if the rest of the code is okay
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  // Both the sda and scl should be high.
+  // If not, there might be a hardware problem with the i2c bus signal lines.
+  // This check was added to prevent that a shortcut of sda would be seen as a valid ACK
+  // from a i2c Slave.
+  uint8_t sda_status = i2c_sda_read();
+  uint8_t scl_status = i2c_scl_read();
+  if(sda_status == 0 || scl_status == 0)
+  {
+    return(false);
+  }
+  else
+  {
+    i2c_sda_lo();
+
+    if (_i2cdelay != 0)
+      delayMicroseconds(_i2cdelay);
+
+    i2c_scl_lo();
+
+    if (_i2cdelay != 0)
+      delayMicroseconds(_i2cdelay);
+  }
+  return(true);
+}
+
+
+//
+// Repeated START instead of a STOP
+//
+// TODO: check if the repeated start actually works.
+//
+void SoftwareWire::i2c_repstart(void)
+{
+  i2c_sda_hi();
+//  i2c_scl_hi();               // ??????
+
+  i2c_scl_lo();                         // force SCL low
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  i2c_sda_hi();                        // release SDA
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  i2c_scl_hi();                        // release SCL
+
+  // Check if clock stretching by the Slave should be detected.
+  if( _stretch)
+  {
+    // If the Slave was stretching the clock pulse, the clock would not go high immediately.
+    // For example if the Slave is an Arduino, that has other interrupts running (for example Serial data).
+    unsigned long prevMillis = millis();
+    while( i2c_scl_read() == 0)
+    {
+      if( millis() - prevMillis >= _timeout)
+        break;
+    };
+  }
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+}
+
+
+// Send a STOP Condition
+//
+// The stop was not recognized by every chip.
+// Some code has been added (with comment "ADDED1"),
+// to be sure that the levels are okay with delays in between.
+void SoftwareWire::i2c_stop(void)
+{
+  i2c_scl_lo();         // ADDED1, it should already be low.
+  i2c_sda_lo();
+
+  // ADDED1, wait to be sure that the slave knows that both are low
+  if (_i2cdelay != 0)              // ADDED1
+    delayMicroseconds(_i2cdelay);  // ADDED1
+
+  // For a stop, make SCL high wile SDA is still low
+  i2c_scl_hi();
+
+  // Check if clock stretching by the Slave should be detected.
+  if( _stretch)
+  {
+    // Wait until the clock is high, the Slave could keep it low for clock stretching.
+    // Clock pulse stretching during a stop condition seems odd, but when
+    // the Slave is an Arduino, it might happen.
+    unsigned long prevMillis = millis();
+    while( i2c_scl_read() == 0)
+    {
+      if( millis() - prevMillis >= _timeout)
+        break;
+    };
+  }
+
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  // complete the STOP by setting SDA high
+  i2c_sda_hi();
+
+  // A delay after the STOP for safety.
+  // It is not known how fast the next START will happen.
+  if (_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+}
+
+
+//
+// Write a byte to the I2C slave device
+// The returned bit is 0 for ACK and 1 for NACK
+//
+uint8_t SoftwareWire::i2c_write( uint8_t c )
+{
+  for ( uint8_t i=0; i<8; i++)
+  {
+    i2c_writebit(c & 0x80);           // highest bit first
+    c <<= 1;
+  }
+
+  return(i2c_readbit());
+}
+
+
+//
+// read a byte from the I2C slave device
+//
+uint8_t SoftwareWire::i2c_read(boolean ack)
+{
+  uint8_t res = 0;
+
+  for(uint8_t i=0; i<8; i++)
+  {
+    res <<= 1;
+    res |= i2c_readbit();
+  }
+
+  if(ack)
+  {
+    i2c_writebit(0);
+  }
+  else
+  {
+    i2c_writebit(1);
+  }
+
+  if(_i2cdelay != 0)
+    delayMicroseconds(_i2cdelay);
+
+  return(res);
+}
diff --git a/Code/SoftwareWire/SoftwareWire.h b/Code/SoftwareWire/SoftwareWire.h
new file mode 100644
index 0000000000000000000000000000000000000000..5d18e27712dece69380d74e353984b4d27e7ea75
--- /dev/null
+++ b/Code/SoftwareWire/SoftwareWire.h
@@ -0,0 +1,86 @@
+
+#ifndef SoftwareWire_h
+#define SoftwareWire_h
+
+#include <Arduino.h>
+
+
+
+// Transmission status error, the return value of endTransmission()
+#define SOFTWAREWIRE_NO_ERROR       0
+#define SOFTWAREWIRE_BUFFER_FULL    1
+#define SOFTWAREWIRE_ADDRESS_NACK   2
+#define SOFTWAREWIRE_DATA_NACK      3
+#define SOFTWAREWIRE_OTHER          4
+
+#define SOFTWAREWIRE_BUFSIZE 32        // same as buffer size of Arduino Wire library
+
+
+class SoftwareWire
+{
+public:
+  SoftwareWire();
+  SoftwareWire(uint8_t sdaPin, uint8_t sclPin, boolean pullups = true, boolean detectClockStretch = true);
+  virtual ~SoftwareWire();
+  void end();
+  
+  void begin();
+  // Generate compile error when slave mode begin(address) is used
+  void __attribute__ ((error("I2C/TWI Slave mode is not supported by the SoftwareWire library"))) begin(uint8_t addr);
+  void __attribute__ ((error("I2C/TWI Slave mode is not supported by the SoftwareWire library"))) begin(int addr);
+
+  void setClock(uint32_t clock);
+  void beginTransmission(uint8_t address);
+  void beginTransmission(int address);
+  uint8_t endTransmission(boolean sendStop = true);
+  uint8_t requestFrom(uint8_t address, uint8_t size, uint8_t sendStop = true);
+  size_t write(uint8_t data);
+  size_t write(const uint8_t* data, size_t quantity);
+  int available(void);
+  int read(void);
+  int readBytes(uint8_t* buf, uint8_t size);
+  int readBytes(char * buf, uint8_t size);
+  int readBytes(char * buf, int size);
+  int peek(void);
+  void setTimeout(long timeout);  // timeout to wait for the I2C bus
+  void printStatus(Print& Ser);   // print information using specified object class
+
+
+private:
+  // per object data
+
+  uint8_t _sdaPin;
+  uint8_t _sclPin;
+  uint8_t _sdaBitMask;
+  uint8_t _sclBitMask;
+  
+  volatile uint8_t *_sdaPortReg;
+  volatile uint8_t *_sclPortReg;
+  volatile uint8_t *_sdaDirReg;
+  volatile uint8_t *_sclDirReg;
+  volatile uint8_t *_sdaPinReg;
+  volatile uint8_t *_sclPinReg;
+
+  uint8_t _transmission;      // transmission status, returned by endTransmission(). 0 is no error.
+  uint16_t _i2cdelay;         // delay in micro seconds for sda and scl bits.
+  boolean _pullups;           // using the internal pullups or not
+  boolean _stretch;           // should code handle clock stretching by the slave or not.
+  unsigned long _timeout;     // timeout in ms. When waiting for a clock pulse stretch. 2017, Fix issue #6
+
+  uint8_t rxBuf[SOFTWAREWIRE_BUFSIZE];   // buffer inside this class, a buffer per SoftwareWire.
+  uint8_t rxBufPut;           // index to rxBuf, just after the last valid byte.
+  uint8_t rxBufGet;           // index to rxBuf, the first new to be read byte.
+  
+  // private methods
+  
+  void i2c_writebit( uint8_t c );
+  uint8_t i2c_readbit(void);
+  void i2c_init(void);
+  boolean i2c_start(void);
+  void i2c_repstart(void);
+  void i2c_stop(void);
+  uint8_t i2c_write(uint8_t c);
+  uint8_t i2c_read(boolean ack);
+};
+
+#endif // SoftwareWire_h
diff --git a/Code/Spresense/recorder/imu/communication.h b/Code/Spresense/recorder/imu/communication.h
new file mode 100644
index 0000000000000000000000000000000000000000..8c8c2f0d3ed24ade0dabf46c1662f4d9466a6328
--- /dev/null
+++ b/Code/Spresense/recorder/imu/communication.h
@@ -0,0 +1,22 @@
+#define IMU_BUFFER_SIZE 32
+#define IMU_HALF_BUFFER_SIZE (IMU_BUFFER_SIZE/2)
+
+#define MSG_FIFO_ADDRESS 1
+
+#define ACK 1
+#define NACK (-1)
+
+typedef struct IMUData {
+  uint64_t timestamp;
+  float temperature;
+  float gyro[3]; // z, y, x
+  float accelerometer[3]; // x, y, z
+  float magnetometer[3]; // x, y, z
+  float orientation[3]; // Yaw, pitch, roll
+} IMUData;
+
+typedef struct IMUFIFO {
+  IMUData imu[IMU_BUFFER_SIZE];
+  int head = 0;
+  int tail = 0;
+} IMUFIFO;
diff --git a/Code/Spresense/recorder/imu/imu.ino b/Code/Spresense/recorder/imu/imu.ino
new file mode 100644
index 0000000000000000000000000000000000000000..23c214c8beede3ef0e96bbc017fd8150e4f62a29
--- /dev/null
+++ b/Code/Spresense/recorder/imu/imu.ino
@@ -0,0 +1,307 @@
+#include <MP.h>
+#include <MPU9250.h>
+#include <Watchdog.h>
+#include "quaternionFilters.h"
+#include "communication.h"
+#include <SoftwareWire.h>
+
+int ledStatus  = LED3;
+
+#define PIN_SDA 14
+#define PIN_SCL 15
+SoftwareWire softWire(PIN_SDA, PIN_SCL, false, false);
+
+char debugMsg[200];
+#define serialDebug false // Print debug data
+
+#define I2Cclock 100000
+#define I2Cport softWire
+#define MPU9250_ADDRESS MPU9250_ADDRESS_AD0
+#define MPU9250_ID (0x71)
+#define MPU9250_MAG_ID (0x48)
+MPU9250 myIMU(MPU9250_ADDRESS, I2Cport, I2Cclock);
+float rawmx, rawmy, rawmz;
+IMUFIFO imuFifo;
+
+bool i2cCheckLineState() {
+
+  sprintf(debugMsg, "Current state sda(%d)=%d, scl(%d)=%d", PIN_SDA, digitalRead(PIN_SDA), PIN_SCL, digitalRead(PIN_SCL));
+  Serial.println(debugMsg);
+
+  // I2C bus OK
+  if (digitalRead(PIN_SDA) && digitalRead(PIN_SCL)) {
+    return true;
+  }
+
+  pinMode(PIN_SDA, INPUT_PULLUP);
+  pinMode(PIN_SCL, INPUT_PULLUP);
+
+  sprintf(debugMsg, "Current state sda(%d)=%d, scl(%d)=%d", PIN_SDA, digitalRead(PIN_SDA), PIN_SCL, digitalRead(PIN_SCL));
+  Serial.println(debugMsg);
+
+  // I2C bus is busy, client keeps SDA high
+  if (!digitalRead(PIN_SDA) || !digitalRead(PIN_SCL)) { 
+    sprintf(debugMsg, "invalid state sda(%d)=%d, scl(%d)=%d", PIN_SDA, digitalRead(PIN_SDA), PIN_SCL, digitalRead(PIN_SCL));
+    Serial.println(debugMsg);
+
+    // Manually cycle the clock until client releases SDA
+    pinMode(PIN_SCL, OUTPUT);
+    digitalWrite(PIN_SCL, HIGH);
+    for (uint8_t a = 0; a < 9; a++) {
+      delayMicroseconds(5);
+      digitalWrite(PIN_SCL, LOW);
+      delayMicroseconds(5);
+      digitalWrite(PIN_SCL, HIGH);
+      if (digitalRead(PIN_SDA)) { // bus recovered
+        sprintf(debugMsg, "Recovered after %d Cycles", a + 1);
+        Serial.println(debugMsg);
+        break;
+      }
+    }
+    
+    // Send start and stop condition to client
+    pinMode(PIN_SDA, OUTPUT);
+    delayMicroseconds(5);
+    digitalWrite(PIN_SDA, LOW);
+    delayMicroseconds(5);
+    digitalWrite(PIN_SDA, HIGH);
+  }
+
+  pinMode(PIN_SCL, INPUT);
+  pinMode(PIN_SDA, INPUT);
+  pinMode(PIN_SCL, INPUT_PULLUP);
+  pinMode(PIN_SDA, INPUT_PULLUP);
+
+  // Double check that the I2C bus is ok
+  if (!digitalRead(PIN_SDA) || !digitalRead(PIN_SCL)) { // bus in busy state
+    sprintf(debugMsg, "Bus Invalid State, TwoWire() Can't init sda=%d, scl=%d", digitalRead(PIN_SDA), digitalRead(PIN_SCL));
+    Serial.println(debugMsg);
+    return false; // bus is busy
+  }
+
+  return true;
+}
+
+void setup()
+{
+  int ret = MP.begin();
+  MP.RecvTimeout(MP_RECV_POLLING);
+
+  Serial.begin(115200);
+  Serial.println("Subcore 1 started");
+
+  i2cCheckLineState();
+
+  softWire.begin();
+
+  byte c = myIMU.readByte(MPU9250_ADDRESS, WHO_AM_I_MPU9250);
+
+  if (c == MPU9250_ID)
+  {
+    myIMU.MPU9250SelfTest(myIMU.selfTest);
+    
+    if(serialDebug)
+    {
+      Serial.print(F("x-axis self test: acceleration trim within : "));
+      Serial.print(myIMU.selfTest[0], 1); Serial.println("% of factory value");
+      Serial.print(F("y-axis self test: acceleration trim within : "));
+      Serial.print(myIMU.selfTest[1], 1); Serial.println("% of factory value");
+      Serial.print(F("z-axis self test: acceleration trim within : "));
+      Serial.print(myIMU.selfTest[2], 1); Serial.println("% of factory value");
+      Serial.print(F("x-axis self test: gyration trim within : "));
+      Serial.print(myIMU.selfTest[3], 1); Serial.println("% of factory value");
+      Serial.print(F("y-axis self test: gyration trim within : "));
+      Serial.print(myIMU.selfTest[4], 1); Serial.println("% of factory value");
+      Serial.print(F("z-axis self test: gyration trim within : "));
+      Serial.print(myIMU.selfTest[5], 1); Serial.println("% of factory value");
+    }
+    
+    myIMU.calibrateMPU9250(myIMU.gyroBias, myIMU.accelBias);
+
+    myIMU.initMPU9250();
+    Serial.println("MPU9250 online");
+
+     byte d = myIMU.readByte(AK8963_ADDRESS, WHO_AM_I_AK8963);
+
+    if (d != MPU9250_MAG_ID)
+    {
+      Serial.print("Could not connect to AK8963: 0x");
+      Serial.println(d, HEX);
+      
+      // Communication failed, stop here      
+      Serial.println(F("Communication failed, abort!"));
+      Serial.flush();
+      abort();
+    }
+
+    myIMU.initAK8963(myIMU.factoryMagCalibration);
+    
+    Serial.println("AK8963 online");
+
+    if (serialDebug)
+    {
+      Serial.println("Calibration values: ");
+      Serial.print("X-Axis factory sensitivity adjustment value ");
+      Serial.println(myIMU.factoryMagCalibration[0], 2);
+      Serial.print("Y-Axis factory sensitivity adjustment value ");
+      Serial.println(myIMU.factoryMagCalibration[1], 2);
+      Serial.print("Z-Axis factory sensitivity adjustment value ");
+      Serial.println(myIMU.factoryMagCalibration[2], 2);
+    }
+    
+    // Get sensor resolutions, only need to do this once
+    myIMU.getAres();
+    myIMU.getGres();
+    myIMU.getMres();
+
+    if (serialDebug)
+    {
+      Serial.print("Resolution value: ");
+      Serial.println(myIMU.mRes, 2);
+    
+      Serial.println("AK8963 mag biases (mG)");
+      Serial.println(myIMU.magBias[0]);
+      Serial.println(myIMU.magBias[1]);
+      Serial.println(myIMU.magBias[2]);
+  
+      Serial.println("AK8963 mag scale (mG)");
+      Serial.println(myIMU.magScale[0]);
+      Serial.println(myIMU.magScale[1]);
+      Serial.println(myIMU.magScale[2]);
+
+      Serial.println("Magnetometer:");
+      Serial.print("X-Axis sensitivity adjustment value ");
+      Serial.println(myIMU.factoryMagCalibration[0], 2);
+      Serial.print("Y-Axis sensitivity adjustment value ");
+      Serial.println(myIMU.factoryMagCalibration[1], 2);
+      Serial.print("Z-Axis sensitivity adjustment value ");
+      Serial.println(myIMU.factoryMagCalibration[2], 2);
+    }
+  }
+  else
+  {
+    Serial.print("Could not connect to MPU9250: 0x");
+    Serial.println(c, HEX);
+
+    // Communication failed, reboot
+    Serial.println(F("Communication failed, abort!"));
+    Serial.flush();
+
+    // Restart processor to try again
+    Watchdog.begin();
+    Watchdog.start(1);
+    while (true) {
+      ;
+    }
+    abort();
+  }
+
+  // Share memory with main core
+  Serial.println("Sending FIFO address...");
+  
+  uint32_t data;
+  int8_t msgid = 0;
+  ret = -1;
+  MP.RecvTimeout(500);
+  while (!(ret >= 0 && msgid == MSG_FIFO_ADDRESS && data == ACK)) {
+    MP.Send(MSG_FIFO_ADDRESS, &imuFifo);
+    Serial.print(".");
+    ret = MP.Recv(&msgid, &data);
+  }
+  MP.RecvTimeout(MP_RECV_POLLING);
+  Serial.println("ACK received");
+
+  pinMode(ledStatus, OUTPUT);
+  digitalWrite(ledStatus, HIGH);
+}
+
+void loop()
+{
+  if (myIMU.readByte(MPU9250_ADDRESS, INT_STATUS) & 0x01)
+  {
+    myIMU.readAccelData(myIMU.accelCount);
+
+    myIMU.ax = (float)myIMU.accelCount[0] * myIMU.aRes;
+    myIMU.ay = (float)myIMU.accelCount[1] * myIMU.aRes; 
+    myIMU.az = (float)myIMU.accelCount[2] * myIMU.aRes;
+
+    myIMU.readGyroData(myIMU.gyroCount); 
+
+    myIMU.gx = (float)myIMU.gyroCount[0] * myIMU.gRes;
+    myIMU.gy = (float)myIMU.gyroCount[1] * myIMU.gRes;
+    myIMU.gz = (float)myIMU.gyroCount[2] * myIMU.gRes;
+
+    myIMU.readMagData(myIMU.magCount);  
+
+    rawmx = (float)myIMU.magCount[0] * myIMU.mRes * myIMU.factoryMagCalibration[0];
+    rawmy = (float)myIMU.magCount[1] * myIMU.mRes * myIMU.factoryMagCalibration[1] ;
+    rawmz = (float)myIMU.magCount[2] * myIMU.mRes * myIMU.factoryMagCalibration[2];
+
+    // Use hardcoded calibration
+    myIMU.mx = (rawmx - myIMU.magBias[0]) * myIMU.magScale[0];
+    myIMU.my = (rawmy - myIMU.magBias[1]) * myIMU.magScale[1];
+    myIMU.mz = (rawmz - myIMU.magBias[2]) * myIMU.magScale[2];
+
+  } 
+  
+  myIMU.updateTime();
+
+  // Sensors x (y)-axis of the accelerometer is aligned with the y (x)-axis of
+  // the magnetometer; the magnetometer z-axis (+ down) is opposite to z-axis
+  // (+ up) of accelerometer and gyro! We have to make some allowance for this
+  // orientationmismatch in feeding the output to the quaternion filter. For the
+  // MPU-9250, we have chosen a magnetic rotation that keeps the sensor forward
+  // along the x-axis just like in the LSM9DS0 sensor. This rotation can be
+  // modified to allow any convenient orientation convention. This is ok by
+  // aircraft orientation standards! Pass gyro rate as rad/s
+  MahonyQuaternionUpdate(myIMU.ax, myIMU.ay, myIMU.az, myIMU.gx * DEG_TO_RAD,
+                         myIMU.gy * DEG_TO_RAD, myIMU.gz * DEG_TO_RAD, myIMU.my,
+                         myIMU.mx, myIMU.mz, myIMU.deltat);
+
+  myIMU.delt_t = millis() - myIMU.count;
+
+  if (myIMU.delt_t > 10)
+  {
+    myIMU.count = millis();
+    myIMU.sumCount = 0;
+    myIMU.sum = 0;
+
+    // Read temperature and convert to Celsius
+    myIMU.tempCount = myIMU.readTempData();
+    myIMU.temperature = ((float) myIMU.tempCount) / 333.87 + 21.0;
+
+    // Convert to yaw, pitch, roll
+    const float * q = getQ();
+    myIMU.yaw   = atan2(2.0f * (q[1]*q[2] + q[0]*q[3]), q[0]*q[0] + q[1]*q[1] - q[2]*q[2] - q[3]*q[3]);
+    myIMU.pitch = -asin(2.0f * (q[1]*q[3] - q[0]*q[2]));
+    myIMU.roll  = atan2(2.0f * (q[0]*q[1] + q[2]*q[3]), q[0]*q[0] - q[1]*q[1] - q[2]*q[2] + q[3]*q[3]);
+    myIMU.pitch *= RAD_TO_DEG;
+    myIMU.yaw   *= RAD_TO_DEG;
+
+    // Declination of LiU
+    // - http://www.ngdc.noaa.gov/geomag-web/#declination
+    myIMU.yaw  -= 5.53;
+    myIMU.roll *= RAD_TO_DEG;
+
+    if (((imuFifo.head + 1) % IMU_BUFFER_SIZE) != imuFifo.tail)
+    {
+      imuFifo.imu[imuFifo.head].timestamp = millis();
+      imuFifo.imu[imuFifo.head].temperature = myIMU.temperature;
+      imuFifo.imu[imuFifo.head].gyro[0] = myIMU.gx;
+      imuFifo.imu[imuFifo.head].gyro[1] = myIMU.gy;
+      imuFifo.imu[imuFifo.head].gyro[2] = myIMU.gz;
+      imuFifo.imu[imuFifo.head].accelerometer[0] = myIMU.ax;
+      imuFifo.imu[imuFifo.head].accelerometer[1] = myIMU.ay;
+      imuFifo.imu[imuFifo.head].accelerometer[2] = myIMU.az;
+      imuFifo.imu[imuFifo.head].magnetometer[0] = rawmx;
+      imuFifo.imu[imuFifo.head].magnetometer[1] = rawmy;
+      imuFifo.imu[imuFifo.head].magnetometer[2] = rawmz;
+      imuFifo.imu[imuFifo.head].orientation[0] = myIMU.yaw;
+      imuFifo.imu[imuFifo.head].orientation[1] = myIMU.pitch;
+      imuFifo.imu[imuFifo.head].orientation[2] = myIMU.roll;
+      
+      imuFifo.head = (imuFifo.head + 1) % IMU_BUFFER_SIZE;      
+      if (imuFifo.head == 0) digitalWrite(ledStatus, !digitalRead(ledStatus)); 
+    }
+  }
+}
diff --git a/Code/Spresense/recorder/recorder.ino b/Code/Spresense/recorder/recorder.ino
new file mode 100644
index 0000000000000000000000000000000000000000..89824f36e17d59dfa94009483cc388401a8ec32b
--- /dev/null
+++ b/Code/Spresense/recorder/recorder.ino
@@ -0,0 +1,409 @@
+/*
+ *  recorder_wav.ino - Recorder example application for WAV(PCM)
+ *  Copyright 2018 Sony Semiconductor Solutions Corporation
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <MP.h>
+#include <SDHCI.h>
+#include <Audio.h>
+
+#include "imu/communication.h"
+#include <arch/board/board.h>
+
+SDClass theSD;
+AudioClass *theAudio;
+
+#define BoardInit 0  /* Initializing */
+#define BoardReady 1   /* Ready to respond */
+#define BoardRecording 2   /* Recording */
+#define BoardTransmitting 3   /* Transmitting */
+#define BoardError 4     /* Error occurred, restart */
+uint8_t boardMode;
+
+#define BUTTON_PIN PIN_D08
+bool buttonPressed = false;
+int64_t last_blink = 0;
+bool Recording = false;
+bool ErrEnd = false;
+
+static const int32_t channels = 8; /* 2, 4, 8) */
+static const int32_t frequency = 48000; /* 16, 48, 64, 96, 128, 192 kHz */
+
+const int subcore = 1;
+IMUFIFO * imu_fifo =(IMUFIFO *) 0;
+  
+#define SERIAL_BUFFFER_SIZE (255)
+uint8_t serialBuffer[SERIAL_BUFFFER_SIZE];
+String command;
+File myFile;
+char filename[100];
+
+#define IMU_FRAME_SIZE (sizeof(magicWord) + sizeof(dataSize) + sizeof(IMUData))
+#define BUFFER_SIZE (1024*28)
+const uint8_t magicWord[] = {0xFE, 0xED, 0xAB, 0xEE, 0xDE, 0xAD};//, 0xBE, 0xEF
+const uint16_t imuSize = sizeof(IMUData);
+uint8_t writeBuffer[BUFFER_SIZE];
+uint16_t lastWrite = 0;
+uint32_t writeSize = 0;
+
+
+int32_t number;
+static const char* fileformat = "Sound%03d.wav";
+
+static void audio_attention_cb(const ErrorAttentionParam *atprm)
+{
+  puts("Attention!");
+  
+  if (atprm->error_code >= AS_ATTENTION_CODE_WARNING)
+    {
+      ErrEnd = true;
+   }
+}
+
+void setup()
+{
+  number = 1;
+  boardMode = BoardInit;
+  
+  puts("Initializing LEDs...");
+  pinMode(LED0, OUTPUT);
+  pinMode(LED1, OUTPUT);
+  pinMode(LED2, OUTPUT);
+
+  puts("Initializing Serial Port...");
+  Serial.begin(115200);
+
+  pinMode(BUTTON_PIN, INPUT_PULLUP);
+  buttonPressed = !digitalRead(BUTTON_PIN);
+        
+  puts("Initializing SD Card...");
+  theSD.begin();
+  
+  puts("Initializing Audio Library...");
+  theAudio = AudioClass::getInstance();
+  theAudio->begin(audio_attention_cb);
+
+  puts("Setting Recorder Mode...");
+  uint8_t input_device = AS_SETRECDR_STS_INPUTDEVICE_MIC;
+  int32_t input_gain = 0;
+  uint32_t buffer_size = 2*SIMPLE_FIFO_BUF_SIZE;
+  bool is_digital = true;
+  err_t res = theAudio->setRecorderMode(input_device, input_gain, buffer_size, is_digital);
+
+  puts("Initializing Recorder...");
+  theAudio->initRecorder(AS_CODECTYPE_WAV,"/mnt/sd0/BIN",frequency, channels);
+  
+  puts("Initializing SubCore 1...");
+  void * data;
+  int8_t msgid = 0;
+  int ret = MP.begin(subcore);
+  if (ret < 0) {
+    printf("MP.begin error = %d\n", ret);
+  }
+  MP.RecvTimeout(MP_RECV_POLLING);
+
+  Serial.println("Subcore started, waiting: ");
+  ret = -1;
+  MP.RecvTimeout(500);
+  while(!(ret >= 0 && msgid == MSG_FIFO_ADDRESS)) {   
+    Serial.print("."); 
+    ret = MP.Recv(&msgid, &data, subcore);
+  }
+  MP.RecvTimeout(MP_RECV_POLLING);
+  Serial.println("Pointer received");
+  imu_fifo = (IMUFIFO *) data;
+  MP.Send(MSG_FIFO_ADDRESS, ACK, subcore);
+  
+  while(ret == 0) {ret = MP.Recv(&msgid, &data, subcore);}
+    
+  digitalWrite(LED0, HIGH);
+  boardMode = BoardReady;
+}
+
+void ListFiles()
+{
+  if (boardMode != BoardReady) return;
+  boardMode = BoardTransmitting;
+  
+  puts("Listing Files...");
+
+  String path = "";
+  File root = theSD.open("");
+  
+  root.rewindDirectory();
+
+  while(true) 
+  {
+    File entry =  root.openNextFile();
+    if (!entry) {
+      Serial2.println("");
+      Serial2.println("");
+      Serial2.println("");
+      Serial2.println("");
+      Serial2.println("");
+      Serial2.println("");
+       break;
+     }
+    String path = entry.name();
+    int sep = path.lastIndexOf('/');
+    path = path.substring(sep+1);
+    sep = path.lastIndexOf('.');
+    if (path.substring(sep+1).equals("wav")) {
+      Serial2.println(path + "\t" + (entry.size()/1024));      
+    }
+    entry.close();
+  }
+  root.close();
+  
+  boardMode = BoardReady;
+}
+
+void StartRecording()
+{
+  if (boardMode != BoardReady)
+  {
+    Serial.print("Wrong board mode: ");
+    Serial.println(boardMode);
+    return;
+  }
+  boardMode = BoardRecording;
+  
+  puts("Opening file...");
+  
+  sprintf(filename, fileformat, number);
+  while(theSD.exists(filename)) //
+  {
+    sprintf(filename, fileformat, ++number);    
+  }  
+  puts(filename);
+    
+  myFile = theSD.open(filename, FILE_WRITE);
+  if (!myFile) 
+  {
+      puts("File open error");
+      ErrEnd = true; return;
+  }
+  
+  puts("Writing header...");
+  theAudio->writeWavHeader(myFile);
+
+  writeSize = 0;
+
+  puts("Starting Recorder...");
+  theAudio->startRecorder();
+  
+  digitalWrite(LED1, HIGH);
+  Recording = true;
+  puts("Recording Started...");
+  lastWrite = millis();
+}
+
+void StopRecording(bool error = false)
+{ 
+  if (boardMode != BoardRecording)
+  {
+    Serial.print("Wrong board mode: ");
+    Serial.println(boardMode);
+    return;
+  }
+  err_t err;
+  
+  puts("Stop Recording...");
+  digitalWrite(LED1, LOW);
+  theAudio->stopRecorder();
+  Recording = false;
+  
+  puts("Closing File...");
+  theAudio->closeOutputFile(myFile);
+  
+  puts("Recording Stopped...");
+  
+  boardMode = BoardReady;
+}
+
+void TransmitFile(String file)
+{
+  if (boardMode != BoardReady) return;
+  boardMode = BoardTransmitting;
+  
+  puts("Opening file...");
+  puts(file.c_str());
+    
+  myFile = theSD.open(file, FILE_READ);
+  
+  /* Verify file open */
+  if (!myFile)
+  {      
+      puts("File for transmission not found...");
+  }
+
+  Serial.println(Serial2.availableForWrite());
+  Serial2.println(myFile.size());
+  Serial.println(myFile.size());
+
+  puts("Transmission start...");
+  // Flush old data
+  while(Serial2.available() > 0) {Serial2.read();}
+  int n = myFile.read(&serialBuffer, SERIAL_BUFFFER_SIZE); 
+  int send_ready = true;
+  while(n > 0)
+  {
+    if (send_ready)
+    {
+      Serial2.write(serialBuffer, n);
+      send_ready = false;
+    }
+    else if (Serial2.available())
+    {
+      int ret = Serial2.read();
+      if (ret == 1)
+      {
+        n = myFile.read(&serialBuffer, SERIAL_BUFFFER_SIZE);
+        send_ready = true;
+      }
+      else if (ret == 2)
+      {
+        break;
+      }
+      else
+      {
+        Serial.println("Resending");
+        send_ready = true;        
+      }
+      
+    }
+
+  }
+  puts("Transmission end...");
+  myFile.close();
+  
+  boardMode = BoardReady;
+}
+
+void loop() 
+{
+  /* Blink status LED to show that it is alive */
+  if (millis()-last_blink > 1000) 
+  {
+    digitalWrite(LED2, !digitalRead(LED2));
+    last_blink = millis();
+  }
+
+  /* Start and stop recording with the press of a button */
+  bool buttonPressedNow = !digitalRead(BUTTON_PIN);
+  if (!buttonPressedNow && buttonPressed) 
+  {
+    if(Recording) StopRecording(); else StartRecording(); 
+  }
+  buttonPressed = buttonPressedNow;
+  
+  /* IMU data available, copy to SD write buffer */
+  if (imu_fifo->tail != imu_fifo->head)
+  {
+    if (Recording) 
+    {
+      // Copy IMU data to write buffer
+      memcpy(&writeBuffer[writeSize], magicWord, sizeof(magicWord)); 
+        writeSize += sizeof(magicWord);
+      memcpy(&writeBuffer[writeSize], &imuSize, sizeof(imuSize)); 
+        writeSize += sizeof(imuSize);
+      memcpy(&writeBuffer[writeSize], &imu_fifo->imu[imu_fifo->tail], imuSize); 
+        writeSize += imuSize;
+    }
+        
+    imu_fifo->tail = (imu_fifo->tail + 1) % IMU_BUFFER_SIZE;
+  }
+
+  if (Serial2.available() > 0) 
+  {    
+    char c = Serial2.read();             // read a byte, then
+    //Serial.write(c);                    // print it out the serial monitor
+    if(c == '\r') 
+    {
+      puts(command.c_str());
+      if (command.startsWith("start"))
+      {
+        StartRecording();
+      }
+      else if (command.startsWith("stop"))
+      {
+        StopRecording();
+      }
+      else if (command.startsWith("list"))
+      {
+        ListFiles();
+      }
+      else if (command.startsWith("status"))
+      {
+        Serial.println(boardMode);
+        Serial2.write(boardMode);
+      }
+      else if (command.startsWith("get"))
+      {
+        command = command.substring(4);
+        TransmitFile(command);
+      }
+
+      command = "";
+    } 
+    else if(c != '\n') 
+    {
+      command += c;
+    }
+  }
+
+  /* Copy audio data to SD write buffer */
+  if (Recording)
+  {
+    uint32_t bytesWritten;
+    uint16_t tempTime;
+    
+    err_t err = AUDIOLIB_ECODE_INSUFFICIENT_BUFFER_AREA;
+
+    while(err == AUDIOLIB_ECODE_INSUFFICIENT_BUFFER_AREA)
+    {
+      err = theAudio->readFrames(&writeBuffer[writeSize], sizeof(writeBuffer) - writeSize, &bytesWritten );
+        writeSize += bytesWritten;
+
+      //printf("dSize = %d\n", writeSize);
+      if(err == AUDIOLIB_ECODE_INSUFFICIENT_BUFFER_AREA) printf("IBA T = %d\n", millis()-lastWrite);
+      
+      /* Write combined stream to SD card */
+      if (bytesWritten > 0) {
+        tempTime = millis();
+        if(tempTime-lastWrite > 24) printf("T: %u\n", tempTime - lastWrite);
+        lastWrite = tempTime;
+        myFile.write(writeBuffer, writeSize);
+        writeSize = 0;
+      }
+    }
+    
+    if (err != AUDIOLIB_ECODE_OK)
+    {
+      printf("File End! =%d\n",err);
+      StopRecording(true);
+    }
+
+  }
+  
+  if (ErrEnd)
+  {
+    printf("Error End\n");
+    StopRecording(true);
+    ErrEnd = false;
+  }
+}
diff --git a/Code/Spresense/recorder_no_serial.ino b/Code/Spresense/recorder_no_serial.ino
new file mode 100644
index 0000000000000000000000000000000000000000..b524f9f7078af76374e076eecdef126eca7ff51d
--- /dev/null
+++ b/Code/Spresense/recorder_no_serial.ino
@@ -0,0 +1,268 @@
+/*
+ *  recorder_wav.ino - Recorder example application for WAV(PCM)
+ *  Copyright 2018 Sony Semiconductor Solutions Corporation
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <MP.h>
+#include <SDHCI.h>
+#include <Audio.h>
+
+#include "imu/communication.h"
+#include <arch/board/board.h>
+
+SDClass theSD;
+AudioClass *theAudio;
+
+#define BoardInit 0  /* Initializing */
+#define BoardReady 1   /* Ready to respond */
+#define BoardRecording 2   /* Recording */
+uint8_t boardMode;
+
+#define BUTTON_PIN PIN_D08
+bool buttonPressed = false;
+int64_t last_blink = 0;
+bool Recording = false;
+bool ErrEnd = false;
+
+static const int32_t channels = 8; /* 2, 4, 8) */
+static const int32_t frequency = 48000; /* 16, 48, 64, 96, 128, 192 kHz */
+
+const int subcore = 1;
+IMUFIFO * imu_fifo =(IMUFIFO *) 0;
+  
+File myFile;
+char filename[100];
+
+#define IMU_FRAME_SIZE (sizeof(magicWord) + sizeof(dataSize) + sizeof(IMUData))
+#define BUFFER_SIZE (1024*28)
+const uint8_t magicWord[] = {0xFE, 0xED, 0xAB, 0xEE, 0xDE, 0xAD};//, 0xBE, 0xEF
+const uint16_t imuSize = sizeof(IMUData);
+uint8_t writeBuffer[BUFFER_SIZE];
+uint16_t lastWrite = 0;
+uint32_t writeSize = 0;
+
+int32_t number;
+static const char* fileformat = "Sound%03d.wav";
+
+static void audio_attention_cb(const ErrorAttentionParam *atprm)
+{
+  puts("Attention!");
+  
+  if (atprm->error_code >= AS_ATTENTION_CODE_WARNING)
+    {
+      ErrEnd = true;
+   }
+}
+
+void setup()
+{
+  number = 1;
+  boardMode = BoardInit;
+  
+  puts("Initializing LEDs...");
+  pinMode(LED0, OUTPUT);
+  pinMode(LED1, OUTPUT);
+  pinMode(LED2, OUTPUT);
+
+  puts("Initializing Serial Port...");
+  Serial.begin(115200);
+
+  pinMode(BUTTON_PIN, INPUT_PULLUP);
+  buttonPressed = !digitalRead(BUTTON_PIN);
+        
+  puts("Initializing SD Card...");
+  theSD.begin();
+  
+  puts("Initializing Audio Library...");
+  theAudio = AudioClass::getInstance();
+  theAudio->begin(audio_attention_cb);
+
+  puts("Setting Recorder Mode...");
+  uint8_t input_device = AS_SETRECDR_STS_INPUTDEVICE_MIC;
+  int32_t input_gain = 0;
+  uint32_t buffer_size = 2*SIMPLE_FIFO_BUF_SIZE;
+  bool is_digital = true;
+  err_t res = theAudio->setRecorderMode(input_device, input_gain, buffer_size, is_digital);
+
+  puts("Initializing Recorder...");
+  theAudio->initRecorder(AS_CODECTYPE_WAV,"/mnt/sd0/BIN",frequency, channels);
+  
+  puts("Initializing SubCore 1...");
+  void * data;
+  int8_t msgid = 0;
+  int ret = MP.begin(subcore);
+  if (ret < 0) {
+    printf("MP.begin error = %d\n", ret);
+  }
+  MP.RecvTimeout(MP_RECV_POLLING);
+
+  Serial.println("Subcore started, waiting: ");
+  ret = -1;
+  MP.RecvTimeout(500);
+  while(!(ret >= 0 && msgid == MSG_FIFO_ADDRESS)) {   
+    Serial.print("."); 
+    ret = MP.Recv(&msgid, &data, subcore);
+  }
+  MP.RecvTimeout(MP_RECV_POLLING);
+  Serial.println("Pointer received");
+  imu_fifo = (IMUFIFO *) data;
+  MP.Send(MSG_FIFO_ADDRESS, ACK, subcore);
+  
+  while(ret == 0) {ret = MP.Recv(&msgid, &data, subcore);}
+    
+  digitalWrite(LED0, HIGH);
+  boardMode = BoardReady;
+}
+
+void StartRecording()
+{
+  if (boardMode != BoardReady)
+  {
+    Serial.print("Wrong board mode: ");
+    Serial.println(boardMode);
+    return;
+  }
+  boardMode = BoardRecording;
+  
+  puts("Opening file...");
+  
+  sprintf(filename, fileformat, number);
+  while(theSD.exists(filename)) //
+  {
+    sprintf(filename, fileformat, ++number);    
+  }  
+  puts(filename);
+    
+  myFile = theSD.open(filename, FILE_WRITE);
+  if (!myFile) 
+  {
+      puts("File open error");
+      ErrEnd = true; return;
+  }
+  
+  puts("Writing header...");
+  theAudio->writeWavHeader(myFile);
+
+  writeSize = 0;
+
+  puts("Starting Recorder...");
+  theAudio->startRecorder();
+  
+  digitalWrite(LED1, HIGH);
+  Recording = true;
+  puts("Recording Started...");
+  lastWrite = millis();
+}
+
+void StopRecording(bool error = false)
+{ 
+  if (boardMode != BoardRecording)
+  {
+    Serial.print("Wrong board mode: ");
+    Serial.println(boardMode);
+    return;
+  }
+  err_t err;
+  
+  puts("Stop Recording...");
+  digitalWrite(LED1, LOW);
+  theAudio->stopRecorder();
+  Recording = false;
+  
+  puts("Closing File...");
+  theAudio->closeOutputFile(myFile);
+  
+  puts("Recording Stopped...");
+  
+  boardMode = BoardReady;
+}
+
+void loop() 
+{
+  /* Blink status LED to show that it is alive */
+  if (millis()-last_blink > 1000) 
+  {
+    digitalWrite(LED2, !digitalRead(LED2));
+    last_blink = millis();
+  }
+
+  /* Start and stop recording with the press of a button */
+  bool buttonPressedNow = !digitalRead(BUTTON_PIN);
+  if (!buttonPressedNow && buttonPressed) 
+  {
+    if(Recording) StopRecording(); else StartRecording(); 
+  }
+  buttonPressed = buttonPressedNow;
+  
+  /* IMU data available, copy to SD write buffer */
+  if (imu_fifo->tail != imu_fifo->head)
+  {
+    if (Recording) 
+    {
+      // Copy IMU data to write buffer
+      memcpy(&writeBuffer[writeSize], magicWord, sizeof(magicWord)); 
+        writeSize += sizeof(magicWord);
+      memcpy(&writeBuffer[writeSize], &imuSize, sizeof(imuSize)); 
+        writeSize += sizeof(imuSize);
+      memcpy(&writeBuffer[writeSize], &imu_fifo->imu[imu_fifo->tail], imuSize); 
+        writeSize += imuSize;
+    }
+        
+    imu_fifo->tail = (imu_fifo->tail + 1) % IMU_BUFFER_SIZE;
+  }
+
+  /* Copy audio data to SD write buffer */
+  if (Recording)
+  {
+    uint32_t bytesWritten;
+    uint16_t tempTime;
+    
+    err_t err = AUDIOLIB_ECODE_INSUFFICIENT_BUFFER_AREA;
+
+    while(err == AUDIOLIB_ECODE_INSUFFICIENT_BUFFER_AREA)
+    {
+      err = theAudio->readFrames(&writeBuffer[writeSize], sizeof(writeBuffer) - writeSize, &bytesWritten );
+        writeSize += bytesWritten;
+
+      //printf("dSize = %d\n", writeSize);
+      if(err == AUDIOLIB_ECODE_INSUFFICIENT_BUFFER_AREA) printf("IBA T = %d\n", millis()-lastWrite);
+      
+      /* Write combined stream to SD card */
+      if (bytesWritten > 0) {
+        tempTime = millis();
+        if(tempTime-lastWrite > 24) printf("T: %u\n", tempTime - lastWrite);
+        lastWrite = tempTime;
+        myFile.write(writeBuffer, writeSize);
+        writeSize = 0;
+      }
+    }
+    
+    if (err != AUDIOLIB_ECODE_OK)
+    {
+      printf("File End! =%d\n",err);
+      StopRecording(true);
+    }
+
+  }
+  
+  if (ErrEnd)
+  {
+    printf("Error End\n");
+    StopRecording(true);
+    ErrEnd = false;
+  }
+}
diff --git a/Design Files/.gitkeep b/Design Files/.gitkeep
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git a/README.md b/README.md
index 2393065a7acbb7e4bcf0a635d2add8fb782880bb..dd5970eb0afd3ea6ff2d2b19f347f23bd10fd906 100644
--- a/README.md
+++ b/README.md
@@ -2,5 +2,6 @@
 
 This project contains
 - Design files for the array frame
-- Hardware descriptions
+- List of hardware components
+- Schematics
 - Source code
\ No newline at end of file