const int LED_PIN = 1; 
const int POT_PIN = 9; 

void setup() {
  pinMode(LED_PIN, OUTPUT); 
}

void loop() {
 
  int potValue = analogRead(POT_PIN); //Potentiometer Value

  int brightness = map(potValue, 0, 1023, 0, 255);

  analogWrite(LED_PIN, brightness);
}