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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
Both I'm afraid - there are no obvious places to wire one on, and the screen is glued on, so you need to use a hot air gun and a lot of care to remove it.
If someone were super motivated they could maybe create a flex PCB that plugged in instead of the heart rate monitor, but it's a lot of work!