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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.
@Fteacher
@GrandVizierOlaf The HRM is pretty unreliable for me too, but some of us on this forum use an external Bluetooth HRM especially when running, to get accurate data. That works pretty reliably. It would benefit some of us if the option is already here...
I agree on the vibrations being a bit weak, but I have to try it more.