> I have an AVR board with a switch shorting a pin to ground, and
> the internal pull up enabled. I found out the resistance was
> less than that of my body and I can make it think the button
> is pressed by touching the pad the switch is soldered too. I
> don't even have to touch the ground plane at the same time.

Your body is picking up power line hum or other noise.

> For some reason the pull up suddenly stopped working.
> Strange.

Yeah, when you zapped it with static from your finger.


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