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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.
@PaoloM
Yes, I updated the firmware yesterday before starting to experiment. I think I used the right end, the one with the female connector. The green cable ends up into a connection labelled DI on the PCB. That green cable has maybe a resistor patched in. The shape is the same as the ones in the reward but it's protected by black tape and I can't verify it unless I tear it apart. I'll check the wirings with a tester.
Thanks!