SunFounder 3in1 Kit
• The resistance between the middle terminal and either one of the outer terminals varies from 0 to the maximum
resistance of the pot as the knob, screw, or slider is moved.
Here is the circuit symbol of potentiometer.
The functions of the potentiometer in the circuit are as follows:
1. Serving as a voltage divider
Potentiometer is a continuously adjustable resistor. When you adjust the shaft or sliding handle of the
potentiometer, the movable contact will slide on the resistor. At this point, a voltage can be output
depending on the voltage applied onto the potentiometer and the angle the movable arm has rotated
to or the travel it has made.
2. Serving as a rheostat
When the potentiometer is used as a rheostat, connect the middle pin and one of the other 2 pins in
the circuit. Thus you can get a smoothly and continuously changed resistance value within the travel
of the moving contact.
3. Serving as a current controller
When the potentiometer acts as a current controller, the sliding contact terminal must be connected
as one of the output terminals.
If you want to know more about potentiometer, refer to: Potentiometer - Wikipedia
Example
• 4.1 Turn the Knob (Basic Project)
1.19. Potentiometer 37
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