Arduino and python codes where python sends sine wave data over serial and...

Arduino and python codes where python sends sine wave data over serial and arduino reads those data and sets dac to those values

UsbReceive.ino

+/*************************************************************************
+* Code that reads values sent from python through serial
+ ************************************************************************/
+ 
+#include <Wire.h>         // For I2C communication with sensor
+#include <Wireling.h>     // For interfacing with Wirelings
+
+// Make Serial Monitor compatible for all TinyCircuits processors
+#if defined(ARDUINO_ARCH_AVR)
+  #define SerialMonitorInterface Serial
+#elif defined(ARDUINO_ARCH_SAMD)
+  #define SerialMonitorInterface SerialUSB
+#endif
+
+
+void setup() {
+
+  SerialMonitorInterface.begin(115200);
+  Wire.begin();
+
+  // Initialize Wireling
+  Wireling.begin();
+  Wireling.selectPort(0); 
+
+  analogWriteResolution(10);  //Change the DAC resolution to 10-bits
+  analogWrite(A0, 0);         // Initialize Dac  to Zero
+
+}
+
+void loop() {
+  int output;
+    //static float x = 270;  // Current degrees for sine wave (initially 270 so that  
+                // the sine wave is initially zero).
+
+  // output = (int) (512.0 * sin(0.017453 * x) + 512); // Sine Wave
+  if (SerialMonitorInterface.available()> -1) {
+    output = SerialMonitorInterface.parseInt();  
+    
+    analogWrite(A0, output); 
+ 
+  }// end if serial available
+   //analogWrite(A0, output); // Write the analog output to A0
+   //SerialMonitorInterface.print(output);
+   //SerialMonitorInterface.println();
+   
+  /*
+   * Increment Degrees for the Next Wave Point
+   * 
+   * To utilize the entire resolution of the 10-bit DAC, at least 1024 
+   * values must be used between 0 and 360 degrees. Therefore, a step 
+   * value greater than 360/1024 will not utilize the entier resolution 
+   * of the DAC.
+   */
+  //x += 0.35; 
+  //if(x>=360.0) x -= 360.0;
+  
+    
+ //delay(1);
+}

usb_send.py

+import serial
+import numpy as np
+import time
+import struct
+
+'''
+Sends sinewave values to arduino dac
+'''
+
+# com port for arduiono usb
+COM = "COM4"
+# baudrate same as in arduino
+BAUDRATE = 115200
+# Current degrees for sine wave (initially 270 so that the sine wave is initially zero).
+x = 270
+
+my_serial = None 
+
+try:
+    my_serial = serial.Serial(COM, baudrate= BAUDRATE, timeout = 2)
+    print("Device found")
+    # start infinite loop 
+    # breaks by key interrupt (ctrl + c)
+    while True:
+        try:
+            # calculate sine wave current value
+            output = 512.0 * np.sin(0.017453 * x) + 512 # Sine Wave
+            # print(output)
+            # translate to something that will be read by arduino
+            arg = bytes(str(int(output)), 'utf8','ignore') + b'\r'
+            # send to arduino serial
+            my_serial.write(arg)
+            time.sleep(0.01)
+            '''
+            * Increment Degrees for the Next Wave Point
+            * 
+            * To utilize the entire resolution of the 10-bit DAC, at least 1024 
+            * values must be used between 0 and 360 degrees. Therefore, a step 
+            * value greater than 360/1024 will not utilize the entier resolution 
+            * of the DAC.
+            '''
+            x += 0.35
+            if(x>=360.0): 
+                x -= 360.0
+        except KeyboardInterrupt:
+            print("Done")
+            break
+except:
+    print("Problem finding device.\nCheck your com port or device.")
+