arduino_bluetooth_led.pde

import processing.serial.*;

Serial arduino;

boolean button = false;

int x = 200;
int y = 180;
int b = 100;
int h = 75;

void setup() {
 size(500, 500);
 arduino = new Serial(this, "COM8", 9600); 
}  

void draw() {
  if(button) {
    background(255, 0 ,0);
    fill(0);
    arduino.write("1");
  }
  else {
  background(0);
  arduino.write("0");
  fill(255, 0, 0);
  }
  rect(x, y, b, h);
}

void mousePressed() {
  if(mouseX > x && mouseX < x+b && mouseY > y && mouseY < y+h)
  {
    button = !button;
  }
}