Whenever I insert a wire into an input pin in my Arduino UNO R3 board, no matter what else is going on with the wire, the digital reading fluctuates all over the place. When I disconnect the wire from the pin, the digital reading stays where it was when I took out the wire, meaning if I take out the…

Pin issue on UNO R3

UKHeliBob February 7, 2024, 10:14pm 9

So turn on the built in pullup resistor on the pin and that will hold it HIGH

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