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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
Yes, it's something I hope to fix soon. Sorry about the inconvenience.
For now you could use the HRM-raw event (mentioned in that issue)
isWearingto detect if the Bangle is worn, and if not you could turn the HRM off and then back on every few seconds to check