• I do occasionally see WARNING: No free GPIOTE for watch on a totally normal Bangle, so I wouldn't worry about it.

    It's complaining about an issue setting a hardware watch with setWatch - but are you actually trying to do that, or are you just reading the pins with digitalRead?

    It's possible that there is an issue with HRM_INT because the firmware may be inserting its own watch on that for the HRM at a lower level? It should still work as a GPIO though, and other pins should be able to be watched

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