I was working on a project before I left for work and powered it up and did not have one resistor (a pressure sensor) connected to a leg of a voltage divider. Now I’m sitting at work and realized that I sent 9V to an analog pin!!! It was turned on and off for few short periods of time (30 seconds or less) and the program in the Arduino was not looking for a signal at that pin. I’m worried that when I get home, I’ll find that I cooked the A0 pin on the uno.
Three quick questions:
I know that it does not take more than a split second of high voltage on the IC to ruin it, but what are the chances that it will be ok?
If I did not cook that input, will it be reliable or should I just use a new pin?
If I DID cook it, will it affect all of the ADC pins?
Right now I’m SO mad at myself for forgetting to plug that sensor in and can not believe that I totally zoned out on the fact that 9V was being fed to an analog pin.