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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.
@Kilrah
Also noticed that problem, reading about half of what it should. Changing period to 20ms helps, I have a BT HRM and when steady the values match but basically as soon as I move my arm around it throws the internal one off completely.