I'm playing around with a SparkFun Redboard (essentially, an Arduino UNO).
I have a simple 5V sensor that I'd been trying to get to work with A2 and analogRead(). Nothing seemed to work. It's supposed to be cycling from 0 to 5V, which should give me values from 0 to 1023, and instead I get constant values of around 260.
In desperation, I tried using other ports. On A0, A1, and A3 I get the signals I expect. On A2, still nada.
So, the question. Is there something I could have done in configuring things that would have made A2 and only A2 stop reading correctly? If so, how can I reset it?
Or is there some other function that I might be using that could interfere with A2? Currently, I'm only using Serial over USB - could that interfere with A2?
Or could I simply have fried the port?