basic-use-of-potentiometer

#define potPin A0    // select the input pin for the potentiometer
int potValue = 0;  // variable to store the value coming from the sensor

void setup() {
  // declare the ledPin as an OUTPUT:
  Serial.begin(9600);
}

void loop() {
  // read the value from the sensor:
  potValue = analogRead(potPin);
  Serial.print("pot value=");
  Serial.println(potValue);
  delay(100);
}