Sending Data from Pd to the Arduino

• The Pd [comport] object can also be used to send data from Pd to the Arduino. (for example, connect and click on a message box with contents [5 6 7 13] to the [comport] object in the arduinoinout patch while running the Arduino sketch below).

• The Arduino Serial functionality can both read and write values to a serial connection. Output values can be viewed using the Serial Monitor in the Arduino IDE. However, the Serial Monitor cannot be used when a serial connection to Pd is active.

• Given this limitation, the Arduino sketch below watches for incoming serial data, sending back the characters that it receives (with a line feed when the character value of 13 is received), so that they can be verified in Pd.

  void setup() 
  {
     Serial.begin(115200);
  }
  
  void loop() 
  {
    if (Serial.available())
    {
      char ch = Serial.read();
      int val = ch;
      if ( val == 13 )
        Serial.println();
      else {
        Serial.print( val );
        Serial.print(' ');
      }
    }
    delay(100);
  }