int ledPin = 3; void setup() { // nothing happens in setup } void loop() { // fade in from min to max in increments of 5 points: for (int fadeValue = 0 ; fadeValue <= 255; fadeValue += 5) { // sets the value (range from 0 to 255): analogWrite(ledPin, fadeValue); // wait for 30 milliseconds to see the dimming effect delay(50); } // fade out from max to min in increments of 5 points: for (int fadeValue = 255 ; fadeValue >= 0; fadeValue -= 5) { // sets the value (range from 0 to 255): analogWrite(ledPin, fadeValue); // wait for 30 milliseconds to see the dimming effect delay(50); } }