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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.
@myownself
Guesstimate might be a little bit on the pessimistic side, but certainly there is work to put in both for implementation and validation. I think I remember there is a constant in the calculation that is specific to the PPG device involved, so we will probably need to experiment to determine this, and it may not be the same for the two versions of the HRM.