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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.
@Gordon
I believe so, yes. If you look at the HRM app you'll see the raw data that comes off the device. Honestly it's hard to see how you could get anything useful out of the data the sensor produces if you're moving your arm around a lot.