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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.
OmegaRogue
Ok, so with the MDBT42 connected, what do you measure between GND and Vin on the MDBT42? So the grey and orange wires.
Or was that what you meant with 2.5v? If so it sounds like something is wrong with your power supply board.