Arduino Simple Experiments Part 3. Fade 3 LEDs OnOff br br Just making three LED's fade in and then fade out using PWM Pulse Width Modulation via the analogWrite() function br br Arduino Leonardo Compatible br br This Indiegogo crowd funding campaign started on Jul 12 and closed on August 10, 2013 (11:59pm PT). br br br br br br br br br br Arduino Leonardo Compatible Code:- br br File : br br experimentpart3.