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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
I think someone else needs to jump in here and answer as I haven't done a great deal of comparison testing, but my experience has been that with the new algorithm, HRM works well enough for everyday use.
However it's not going to compete with a device that uses an actual ECG - it's a different technology that is much less susceptible to movement.