// by Les Hall 2013
// public domain code - use freely


// global variables
float timeStep = 0.0001;
float time = 0.0;
int redPin = 2;
int greenPin = 1;
int bluePin = 0;
float red = 127.0;
float green = 127.0;
float blue = 127.0;


// the setup routine runs once when you press reset:
void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}


// the loop routine runs over and over again forever:
void loop() {
  red = 127.5 + 127.0 * float(sin(17.0 * time / 3.0));
  green = 127.5 + 127.0 * float(sin(13.0 * time / 5.0));
  blue = 127.5 + 127.0 * float(sin(11.0 * time / 7.0));
  analogWrite(redPin, int(red));
  analogWrite(greenPin, int(green));
  analogWrite(bluePin, int(blue));
  delay(2.0);
  time += timeStep;
  if (time >= TWO_PI) {
    time -= TWO_PI;
  }
}