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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.
@dapgo
What about the heart rate sensor?
Though I assume that it would be several times better than Bangle.js
Can it obtain relatively accurate data to be used during sports?
And if the wrist sensor hw is not good enough, would it be feasible to receive info from a BLE chest band?