Potentiometer with Arduino :- https://techzeero.com/arduino-tutorials/how-to-use-potentiometer-with-arduino/

Potentiometer with Arduino.ino

/*
   How to use Potentiometer with Arduino
   For more details, visit: https://techzeero.com/arduino-tutorials/how-to-use-potentiometer-with-arduino/

  AnalogReadSerial
  Reads an analog input (potentiometer) on pin 0,
  prints the result to the serial monitor.

  OPEN THE SERIAL MONITOR TO VIEW THE OUTPUT FROM THE POTENTIOMETER >>

  Attach the center pin of a potentiometer to pin A0, 
  and the outside pins to +5V and ground.
*/

int sensorValue = 0;

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

void loop()
{
  // read the input on analog pin 0:
  sensorValue = analogRead(A0);
  
  // print out the value you read:
  Serial.println(sensorValue);

  delay(10); // Delay a little bit to improve simulation performance
}