TIP120 motor control

tip120.ino

//////////////////////////////////////////////////////////////////
//©2011 bildr
//Released under the MIT License – Please reuse change and share
//Simple code to output a PWM sine wave signal on pin 9
//////////////////////////////////////////////////////////////////

#define fadePin 9

void setup(){
	pinMode(fadePin, OUTPUT);
}

void loop(){
	for(int i = 0; i<360; i++){
		//convert 0-360 angle to radian (needed for sin function)
		float rad = DEG_TO_RAD * i;

		//calculate sin of angle as number between 0 and 255
		int sinOut = constrain((sin(rad) * 128) + 128, 0, 255);
		analogWrite(fadePin, sinOut);
		delay(15);
	}
}