Quote:
Originally Posted by Tom Bottiglieri
Is it common for a floating ADC input to swing with the other ports? It seems like this is caused by some high impedance connection between the input pins.
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It's common for there to only be one ADC on a microcontroller, and use a mux to select each one to sample one at a time. If the input is floating, and the mux switches to it, the previous sample is retained. That's what's happening in this case.