Potentiometers in Analog Inputs

[Alan Anderson]

Originally Posted by brVex

The Innovation First RC Reference Guide tells how connect a potentiometer to an Analog Input. He suggests the use of 250Ω – 100KΩ potentiometers.

I have a lot of 22R potentiometers and I would like to know if you can use them?

if not, why?

Don't use them.

Your potentiometers have a resistance of 22 ohms. That will place a relatively high load on the sensor power supply. At 5 volts, it will be drawing more than 200 milliamps and constantly dissipating more than a watt of power. It will probably "work", but it's outside the recommended range of values by an order of magnitude.