int ledPin = 12;      // LED connected to digital pin D12
int analogPin = A0;  // potentiometer connected to analog pin A0
int val = 0;         // variable to store the read value

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

void loop()
{
  val = analogRead(analogPin); // read the input pin
  analogWrite(ledPin, val / 16);// analogRead values go from 0 to 4095, analogWrite values from 0 to 255
}