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Poolitzer
- You don't need to modify the firmware to use the button, there are several functions for that (setWatch or setUI)
- No extra module, button see above, HRM http://www.espruino.com/Reference#l_Bangle_HRM
- The bangles only way to communicate to other devices is with Bluetooth, so yes, use that.
- You don't need to modify the firmware to use the button, there are several functions for that (setWatch or setUI)