Potentiometer Reference

A rotary variable resistor used as an analog input. Turning the knob changes the voltage on the SIG (wiper) pin.

Pin names

Attributes

This component has no configurable attributes.

Usage

Connect VCC to 5V, GND to GND, and SIG to an analog input pin (A0–A5 on an Uno). Read the value with analogRead(), which returns 0–1023.

const int POT_PIN = A0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  int value = analogRead(POT_PIN);
  Serial.println(value);
  delay(100);
}

To use the value for PWM output (0–255), scale it with map():

int brightness = map(analogRead(POT_PIN), 0, 1023, 0, 255);
analogWrite(LED_PIN, brightness);

Examples

See also

• Slide Potentiometer — linear travel instead of rotary
• Photoresistor — light-dependent analog input instead of manual control