I bought a motor driver shield for my UNO. It has a bunch of switches to choose where the driver gets its 5V from, where the motor voltage comes from etc. I hooked up one 9V supply to the Arduino and another to the motor driver (one of the possible configurations according to the driver documentatio…

Uh oh...

kg4wsv October 16, 2012, 4:56pm 9

I am wondering (just because I am a curious type) why you would get ANY voltage on a pin that is set to input?

Is the internal pullup enabled?

Topic		Replies	Views
ALL Pins On Arduino Fried?! IDE 1.x	4	1517	May 5, 2021
When you burn out one pin... IDE 1.x	15	5124	May 5, 2021
Did I fry my Arduino Uno? IDE 1.x	8	1612	May 5, 2021
Arduino pin always HIGH IDE 1.x	6	2144	May 5, 2021
Voltage Differences on Output Pins Troubleshooting	6	1345	May 6, 2021