Evaluating distance using ultrasonic waves:

The MIDI-STICK is an acrylic glass-tube, 20cm in length, with a diameter of 25mm.
Depending on his/her movement the performer, dancer or musician, sends a wireless data stream to the computer and creates the own sounds.

The MIDI-STICK was created by Martin Hug at HANGAR Barcelona 2007.
A detailed description of the circuitry you find here: drumanart.com

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