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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, the health app has the HRM off by default and it needs to be enabled in settings, because right now with the firmware in its current state it does drain the battery pretty quick. Also it can make the light turn on at night if you're not wearing the Bangle, which might also be annoying.
Hopefully as the firmware improves I'll move to enabling it by default though