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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.
@AkosLukacs
Depends a lot on where / how you wear it, do you move, etc. Like I got the best heart rate signal when I put one of my fingers on top of the hearth rate sensor at a specific way/direction. Not wearing on my wrist...