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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.
@HughB
BTW I think the Bangle 2 Heart rate monitor is spot on.
See charts below.
I can see a lower heart rate at 5am when I will have been in deep sleep.
And the average for the day looks about what I would expect, based on other smart watches.
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