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 If you like music and microcontroller check out this Arduino controlled DrummerBot that Steffest built. It uses an Arduino to control a bunch of bits and pieces of spare parts.
 “The Arduino receives the string, unpacks it back to a pattern and simple loops over the steps controlling each servo.
I’m specifically fond of the “Horns” They are 2 little fans with a servo pushing a piece of plastic against the blades. A hell of a noise but when you add heaps of fuzz, chorus and overdrive effects they are pretty convincing.”