Controlando Led RGB com Arduino e Processing - Arquivo 012

Referência:
http://blog.bsoares.com.br/processing/controlling-rgb-led-with-arduino-and-processing

Lista de Materiais:
IDE Arduino 1.0.6
IDE Processing 3 3.0b6 Alpha
1x  Board Arduino NANO
1x  Protoboard 830 furos
1x  Cabo USB-A male to USB-mini male 

1x  Conj. de fios jumper p/ protoboard
1x  Bolinha de ping-pong
1x  Led RGB - Catodo comum
2x  Resistor 90R 1/4w
1x  Resistor 150R 1/4w

Montagem:

Firmware - Arduino:
#define START_COLOR_CHAR '^'
#define END_COLOR_CHAR '$'
#define COLOR_SIZE 8
#define PIN_RED 9
#define PIN_GREEN 11
#define PIN_BLUE 10
//******************************************************************************* char serialMessage[COLOR_SIZE];
unsigned int readChar;
unsigned int count;
unsigned long color;
unsigned int r;
unsigned int g;
unsigned int b;
boolean readingSerial;
//******************************************************************************* void setup() {
  Serial.begin(9600);
  readingSerial = false;
}
//******************************************************************************* void loop() {
  if (Serial.available() > 0 && !readingSerial) {
    if (Serial.read() == START_COLOR_CHAR) {
      serialReadColor();
    }
  }
}
//******************************************************************************* void serialReadColor() {
  readingSerial = true;
  count = 0;
  
  iniReading:
  if (Serial.available() > 0) {
    readChar = Serial.read();
    if (readChar == END_COLOR_CHAR || count == COLOR_SIZE) {
      goto endReading;
    } else {
      serialMessage[count++] = readChar;
      goto iniReading;
    }
  }
  goto iniReading;
  
  endReading:
  readingSerial = false;
  serialMessage[count] = '\0';
  
  setColor(serialMessage);
}
//******************************************************************************* void setColor(char* value)
{
  // Convert Char* to Long
  color = atol(value);
  
  // Extract RGB
  r = color >> 16 & 0xFF;
  g = color >>  8 & 0xFF;
  b = color >>  0 & 0xFF;
  
  // Send values to analog pins
  analogWrite(PIN_RED, r);
  analogWrite(PIN_GREEN, g);
  analogWrite(PIN_BLUE, b);

}

Firmware - Processing:
import processing.serial.*;

Serial port;
//******************************************************************************* void setup() {
  size(100, 150);
  noStroke();
  // Background
  colorMode(HSB, 100);
  for (int i = 0; i < 100; i++) {
    for (int j = 0; j < 100; j++) {
      stroke(i, j, 100);
      point(i, j);
    }
  }
  // Select port
  println(Serial.list());
  //port = new Serial(this, Serial.list()[1], 9600);
  port = new Serial(this, "COM16", 9600);        
}
//******************************************************************************* void draw() {
  // Only to enable the method mouseDragged
}
//******************************************************************************* void mouseClicked() {
  processColor();
}
//******************************************************************************* void mouseDragged() {
  processColor();
}
//*******************************************************************************
void processColor() {
  color c = get(mouseX, mouseY);
  noStroke();
  fill(c);
  rect(0, 100, 100, 50);
  sendColorToSerial(c);
}
//******************************************************************************* void sendColorToSerial(color colour) {
  // Get HEX
  String hexColor = hex(colour, 6);
  
  // Convert HEC to Number
  long numColor = unhex(hexColor);
  
  // Send color number to serial port
  port.write("^" + numColor + "$");
}

Download: https://processing.org