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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
Wow, that's very impressive!
The accelerometer is on the PCB and it has its own I2C lines, so I wouldn't have thought that anything you do with the HRM would affect it. You could check with
Bangle.accelRdand see if you can communicate with it at all? It's possible that you got a solder splash or something on a wire which shorted one of the data connections to it out?