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It's always a floating input. (lemmy.ca)
submitted 1 year ago by [email protected] to c/[email protected]
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If your circuit is behaving weirdly, switching on when you touch a wire or move your hand over the circuit you almost certainly have a floating input. You can solve this problem with a pull-up resistor. Many AVRs have built-in pull-up resistors that you can turn on using code.

In Sketch:

pinMode(2, INPUT_PULLUP);

In BascomAVR:

Config Portb.1 = Input Set Portb.1

There's a great article at SparkFun about Pull-up Resistors.

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this post was submitted on 15 Jun 2023
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