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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.
@user140377
This is the other part of the problem: This is a fft in BPM of the PPG sensor of the Bangle 2 (similar for Bangle 1) without motion 8s after starting the sensor. As you can see, there is a spike at < 30BPM, 47BPM and 81BPM that hide the real heart rate at 71BPM. At gets a bit better after 10s or so, but the noise more less comes back.
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