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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
There is an IR led and sensor, so the HRM measures if the light from the IR LED is getting reflected back to it. It should be a pretty good indicator of whether the Bangle is against something - but obviously if the Bangle is on a hard surface it'll say it's worn when it's not
Which
isWornfunction are you referring to? the field in HRM-raw, or something else?