Arduino Serial LED Fader

serial-led.ino

/*
  Turns on the led using serial
 */
 
// Initialize the LEDs
int blue = 9;
int green = 10;
int red = 11;

// Initialize the integers to keep the values of the leds
int blue_value;
int red_value;
int green_value;

// the setup routine runs once when you press reset:
void setup() {                
  // initialize the pin as an output.
  pinMode(blue, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  //   Start serial
  Serial.begin(9600);
}

void loop() {
  // Wait until we receive the 0xFF Character
  if (Serial.read() == 0xFF) {
    // Wait until we have 3 bytes available
    while (!(Serial.available() > 3)) Serial.println("wait");
    
    blue_value = Serial.read();
    red_value = Serial.read();
    green_value = Serial.read();

    // Echo back what we just received for debugging
    char sendBuffer[3];
    sprintf(sendBuffer, "%d%d%d", blue_value, red_value, green_value);
    Serial.println(sendBuffer);
    
    // Write the LED Values to show the colours
    analogWrite(blue, blue_value);
    analogWrite(green, green_value);
    analogWrite(red, red_value);
  }
}