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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
Yes, it would be possible - but I wouldn't expect you to get too far with a CR2032 I'm afraid - that's only 3v @ 240mAh, so even if it was 100% efficient (it won't be) you'll only get one full watch charge out of it