Laser Harp — DIY How-to from Make: Projects

Stephen Hobley‘s Make/Arduino project (not for beginners, but not that complex) describes how to create a “laser harp” that works as a MIDI controller … as you wave your hands through the laser beam, the output can control pitches or other synth features. Looks cool!

First I’ll show how to make a single-beam laser theremin, which changes pitch with the position of your hand. Then we’ll replicate the circuit and reprogram the Arduino to produce a multi-string harp, with each beam corresponding to a different note. The Arduino has 6 analog inputs, so this harp is limited to 6 beams, but at the end of the article I’ll suggest ways to expand it.

RELATED PROJECT. A Touchless 3D Tracking Interface. Besides an Arduino, this project uses capacitance instead of a laser to track the position of your hand. An easier and faster project.