const int ledPin = 13;      // the pin that the LED is attached to
const int potPin = A0;      // the analog pin that the potentiometer is attached to

void setup() {
  pinMode(ledPin, OUTPUT);  // initialize the LED pin as an output
}

void loop() {
  int brightness = analogRead(potPin);  // read the value from the potentiometer (0-1023)
  brightness = map(brightness, 0, 1023, 0, 255); // map the potentiometer value to brightness range (0-255)
  analogWrite(ledPin, brightness);  // set the LED brightness using PWM
  delay(10);  // optional delay for smoother adjustment
}