• The pins on the IO expander might be free, but I think it'll be very difficult to connect to them.

    One potential option which should be pretty easy to get to is the HRM and the buttons. The black flex cable for those is soldered to the PCB and is reasonably course pitch so can be soldered to quite easily.

    The pins are inverted in software inside Espruino, but other than that, when the buttons aren't pressed down the pins are effectively free to use.

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