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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.
user156359
@Gordon
Thanks, yes that's about where I am with it as well - Bangle.js 2 does have a membrane, and it does seem to work ok - but it's still something you can't really rely on for proper submersion (like swimming).
Heart rate is a hard one for me to add on a custom-designed watch, but I do think it is expected of a wearable at the moment so probably is needed.
Bangle.js 2 does do this already (well, it allows the screen to be rotated) - check out the LCD page in Settings