Edited together a video for fun of myself experimenting with an Arduino, Processing (minim library), and Lights.

A microphone is listening for certain frequencies.
So when I whistle, it hears those frequencies, it tells the Arduino microcontroller to flicker the lights which are controlled by an extension cord and relay plugged into a breadboard.

I also made the audio track by playing around with samples and slowing them down in Traktor Pro 2.

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