@Moors7, connecting 12V to a digital pin will most likely blow its protection diodes and kill THAT pin. If the core gets very hot after 3 seconds then you may also have blown the 3.3V regulator.
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@Moors7, connecting 12V to a digital pin will most likely blow its protection diodes and kill THAT pin. If the core gets very hot after 3 seconds then you may also have blown the 3.3V regulator.