Potentiometer

This device can vary its resistance.

It can be used to adjust the volume or the brightness of a light.

Required Hardware

• Variable resistor (B10K used in this text)
• Arduino UNO
• UNO Cable
• Breadboard
• M-M Cable (3 pieces)

Connection

• Power is applied to the left and right, with the output coming from the middle.
• Power is applied to either the left or right, with the opposite terminal connected to GND.
• Connecting as described, turning to the right increases the value, but if connected oppositely (right to GND, left to 5V), turning to the left increases the value.

Variable Resistor	Arduino UNO
Left	GND
Middle	A0
Right	5V

Example Code

#define input A0

void setup()
{
  // Start serial communication
  Serial.begin(9600);
  Serial.println("start");
  Serial.println("======================");
}

void loop()
{
  // Display the value of the variable resistor on the serial monitor
  Serial.println(analogRead(input));
  delay(1000);
}