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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
I've done a few old fashioned tests (watch and finger on pulse) and have confirmed pretty much what I suspected. Even staying still, the Bangle is missing every second beat. It reports pretty much exactly half my actual heart rate, sometimes claiming 100% confidence.