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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
Ahh! Right, I think I know the issue.
Do you think your BangleRun and HRM widget were out of date? Because I think maybe if a widget was trying to turn the heart rate monitor off, it would turn it off for BangleRun and stop it recording the heart rate. Newer versions should have fixed that i hope.