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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.
@OwenBrotherwood
Hmmm, with all the power needs, may have to go for a puck-pendant-watch: which actually could make things a lot easier as the button may present interesting problems if as a wrist watch
https://learn.adafruit.com/sound-reactive-neopixel-peace-pendant