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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.
@Mi
FYI: just checked here with kickstarter bangle2: HR is 10bpm(+-2) below chest belt in rest
with Firmware 17.93 (already binary blob, right?) and current stable 18.00.
With older firmware it was pretty exact at rest. So looks like this is a reproducible general effect.
Glad you already have an idea about the cause.