int potpin = A0;  // analog pin used to connect the potentiometer
int ledpin = 13;
int val;    // variable to read the value from the analog pin 
 
void setup() 
{ 
pinMode(ledpin, OUTPUT); 
} 
 
void loop() 
{ 
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023) 
  val = map(val, 0, 1023, 500, 5);     // scale it to use it with the servo (value between 0 and 180) 
  digitalWrite(ledpin, HIGH);
  delay(val);                           // waits for the servo to get there 
  digitalWrite(ledpin, LOW);
  delay(val);
}