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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.
@user140377
And let me remind you that even algorithms like WPFV [1] do produce values that differs significantly from the actual BPM, e.g. 15BPM for several seconds.
[1] https://github.com/andtem2000/PPG