Arduino RGB Fading for Common Anode Rgb Leds.c

// Arduino RGB Fading for Common Anode Rgb Leds
//D3,D5,D6 are PWM pins
const int redPin = 3;
const int grnPin = 5;
const int bluPin = 6;

// Setup for outputs
void setup()
{
  pinMode(redPin, OUTPUT);    
  pinMode(grnPin, OUTPUT);    
  pinMode(bluPin, OUTPUT);
}

// Loop for fading
void loop() {
	redtoyellow();
	yellowtogreen();
	greentocyan();
	cyantoblue();
	bluetomagenta();
	magentatored();
}

// Functions for fade between 2 colors
void redtoyellow()
{
  digitalWrite(redPin, LOW);
  digitalWrite(bluPin, HIGH);

  // fade up green
  for(byte i=1; i<100; i++) {
	byte on  = i;
	byte off = 100-on;
	for( byte a=0; a<100; a++ ) {
  	digitalWrite(grnPin, LOW);
  	delayMicroseconds(on);
  	digitalWrite(grnPin, HIGH);
  	delayMicroseconds(off);
	}
  }
}

void yellowtogreen()
{
  digitalWrite(grnPin, LOW);
  digitalWrite(bluPin, HIGH);

  // fade down red
  for(byte i=1; i<100; i++) {
	byte on  = 100-i;
	byte off = i;
	for( byte a=0; a<100; a++ ) {
  	digitalWrite(redPin, LOW);
  	delayMicroseconds(on);
  	digitalWrite(redPin, HIGH);
  	delayMicroseconds(off);
	}
  }
}

void greentocyan()
{
  digitalWrite(grnPin, LOW);
  digitalWrite(redPin, HIGH);

  // fade up blue
  for(byte i=1; i<100; i++) {
	byte on  = i;
	byte off = 100-on;
	for( byte a=0; a<100; a++ ) {
  	digitalWrite(bluPin, LOW);
  	delayMicroseconds(on);
  	digitalWrite(bluPin, HIGH);
  	delayMicroseconds(off);
	}
  }
}

void cyantoblue()
{
  digitalWrite(bluPin, LOW);
  digitalWrite(redPin, HIGH);

  // fade down green
  for(byte i=1; i<100; i++) {
	byte on  = 100-i;
	byte off = i;
	for( byte a=0; a<100; a++ ) {
  	digitalWrite(grnPin, LOW);
  	delayMicroseconds(on);
  	digitalWrite(grnPin, HIGH);
  	delayMicroseconds(off);
	}
  }
}

void bluetomagenta()
{
  digitalWrite(bluPin, LOW);
  digitalWrite(grnPin, HIGH);

  // fade up red
  for(byte i=1; i<100; i++) {
	byte on  = i;
	byte off = 100-on;
	for( byte a=0; a<100; a++ ) {
  	digitalWrite(redPin, LOW);
  	delayMicroseconds(on);
  	digitalWrite(redPin, HIGH);
  	delayMicroseconds(off);
	}
  }
}

void magentatored()
{
  digitalWrite(redPin, LOW);
  digitalWrite(grnPin, HIGH);

  // fade down blue
  for(byte i=1; i<100; i++) {
	byte on  = 100-i;
	byte off = i;
	for( byte a=0; a<100; a++ ) {
  	digitalWrite(bluPin, LOW);
  	delayMicroseconds(on);
  	digitalWrite(bluPin, HIGH);
  	delayMicroseconds(off);
	}
  }
}