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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
Going forward, https://www.espruino.com/Bangle.js2 will have more details.
I do have a build for the heart rate sensor at https://github.com/espruino/Espruino/tree/VC31 - it still needs some work but I hope it'll be merged this week and at that point I'll update the hackaday page's status