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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.
@kri100s
Ok, if its just the button battery life shouldn't be an issue. Ultraleap seems a bit short range but probably perfect for your application. TOF cameras are more available and cheap nowadays. I havent tried it for gestures though.