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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.
@user107850
thanks for the explanation, now it's more or less clear.
As for testing, I have created a repo for testing the algos of BangleJS. Currently it contains only the step counter, but we could happily add also the heart rate. The idea is to upload some test data with reference (maybe coming from another commercial sensor) and benchmark different algorithms.