• sometimes it does measure something even though I'm not wearing the watch

    Yes, it's a shame the binary blob HRM isn't a bit smarter. If the Bangle isn't facing anything it knows it's not being worn and you don't get an HRM but if the HRM is pointing at something and getting a reflection it thinks it is worn and you're just being very still.

    I guess one option is we add a specific check for a lack of movement plus the bangle being pretty much flat on a surface (which I guess is 95% of times it's left) and disable the HRM in that case

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