int analogPin = A1; // potentiometer wiper (middle terminal) connected to analog pin 3
int ledPin = 7;    // outside leads to ground and +5V
int val = 0;  // variable to store the value read

    void setup() {
      Serial.begin(9600);           //  setup serial
      pinMode(ledPin, OUTPUT);
    }

    void loop() {
      val = analogRead(analogPin);  // read the input pin
      int brightness = val / 2;
      analogWrite(ledPin, brightness);
      Serial.println(val);          // debug value
    }