I made a MIDI-controller out of cheap sonars and an Arduino, that lets you control anything with movement "in the air". You can use it to control filters, or vo

I made a MIDI-controller out of cheap sonars and an Arduino, that lets you control anything with movement "in the air". You can use it to control filters, or volume, or anything really. Here's me playing it with a silly wig: https://www.youtube.com/watch?v=tgH-WU-9CZA https://www.youtube.com/watch?v=tgH-WU-9CZA The artist "Mezerg" uses a MIDI-enabled Theremin to do something similar, but it's costly. The BOM for my thing is around $30 when building just one at at time (excluding time spent of course); if mass produced the unit cost could probably be quite low. But the market is probably extremely small... maybe 200 devices? So I didn't pursue mass production.