// Learning Processing
  // Daniel Shiffman
  // http://www.learningprocessing.com
  
  // Example 19-10: Serial communication with Strings
  
  import processing.serial.*;
  
  int r,g,b;    // Used to color background
  Serial port;  // The serial port object
  
  void setup() {
    size(200,200);
    
    // In case you want to see the list of available ports
    // println(Serial.list());
    
    // Using the first available port (might be different on your computer)
    port = new Serial(this, Serial.list()[0], 9600);
    // Request values right off the bat
    port.write(65);
  }
  
  void draw() {
    // Set the background
    background(r,g,b);
  }
  
  // Called whenever there is something available to read
  void serialEvent(Serial port) {
    // Data from the Serial port is read in serialEvent() using the readStringUntil() function with * as the end character.
    String input = port.readStringUntil('*'); 
    
    if (input != null) {
      // Print message received
      println( "Receiving:" + input);
      
      // The data is split into an array of Strings with a comma or asterisk as a delimiter and converted into an array of integers.
     int[] vals = int(splitTokens(input, ",*")); 
      
      // Fill r,g,b variables
      r = vals[0];
      g = vals[1];
      b = vals[2];
    }
    
    // When finished ask for values again
    port.write(65);
  }