#define LED_PIN 3
#define POTENTIOMETER_PIN A7

void setup() {
  // put your setup code here, to run once:
   pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int potentiometerValue = analogRead (POTENTIOMETER_PIN);
  int brightness = potentiometerValue / 4;
  analogWrite (LED_PIN, brightness);
}