int pinled = 11;
int potpin = 0;  // analog pin used to connect the potentiometer
int val;    // variable to read the value from the analog pin

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

void loop()
{
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 255);     // scale it to use it with the servo (value between 0 and 255)
  analogWrite (pinled, val); //
}