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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
Sadly I think that is the case :( Every IO on the nRF52 chip is accounted for at https://www.espruino.com/Bangle.js+Technical
I guess it could be on the IO expander, but I can guarantee that the original firmware didn't use any other IOs
I'd love to be proven wrong though, so if you do find a way to make it work let us know!