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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@alexanderbrevig
I've already made a theremin once (though using an LED) ;) I posted the library under my AlphaBeta alias over at the Arduino camp some years ago. Not sure it can be found because I deleted a lot of stuff from my wiki at some point...
It's difficult to play professional theremins, and a dumb implementation with trickery makes for impossible-to-play noise gens.
I had mine skip between notes in a scale (minor, major and pentatonic) then I had a pot I could turn to change between them. That one made it sound OK but was not as fun to play, of course :)