Resistor on potentiometer
I want to use a potentiometer with an UNO board, and I got the advice that I should always use resistors in the circuit. The potentiometer is a B50K. The circuit would include the UNO board, the potentiometer and the breadboard. I want to learn to read signals from it.
So the question is if I should use resistors in the circuit?
I understand that the potentiometer has its won resistance, but when fully "open" I read that it has 0 Ohm resistance. Wouldn't it damage my pin if that much current went in?
3 Replies
You don't need a resistor. The only current flowing will be that drawn by the GPIO and the ADC has a high input impedance. This is different than a resistor between power and ground or a current limiting resistor used with an LED. The main concern is to never apply greater than 5v to the gpio even with the potentiometer.
Thank you!