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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
Nice idea! Puck.js does have a FET that'll drive 500mA too, so you could stick a COB LED on that inside the case. It's only got a 3v watch cell though.
It'd be great if you could just buy something cheap that had the battery, charge circuitry, nRF52 and FETs in it - but right now the DSD6 it probably the cheapest way to do that!