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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.
@Gordon
I don't have anything right now that I'd feel confident recommending. None of the stuff I tried was great, but I did find some cool tiny ones like https://uk.farnell.com/multicomp/mcabt-456-rc/audio-element-piezo-9-5khz-12mm/dp/2433032 if you wanted to try sticking them to the rear of the watch