RGB led

rgb.ino

// Output
int redPin   = 9;   // Red LED,   connected to digital pin 9
int greenPin = 10;  // Green LED, connected to digital pin 10
int bluePin  = 11;  // Blue LED,  connected to digital pin 11

int r, g, b;
int rd, gd, bd;

int wait = 20; //20ms

void outputColour(int red, int green, int blue) {
	analogWrite(redPin, red);
	analogWrite(bluePin, blue);
	analogWrite(greenPin, green);
}

void setup()
{
	pinMode(redPin,   OUTPUT);   // sets the pins as output
	pinMode(greenPin, OUTPUT);
	pinMode(bluePin,  OUTPUT);
	r = g = b = 0;
	Serial.begin(9600);
}

// Main program
void loop()
{
	if (r >= 255) {
		rd = -1;
	}
	if (r <= 1) {
		rd = 1;
	}
	if (g >= 254) {
		gd = -2;
	}
	if (g <= 1) {
		gd = 2;
	}
	if (b >= 253) {
		bd = -3;
	}
	if (b <= 1) {
		bd = 3;
	}

	r += rd;
	g += gd;
	b += bd;

	outputColour(r, g, b);
	Serial.print(r);
	Serial.print(g);
	Serial.println(b);
	delay(wait);
}