const int potPin = 0; 
const int ledPin = 10; 
int val = 0; 
void setup()
{
  pinMode(ledPin, OUTPUT); 
  Serial.begin(9600);
}
void loop() 
{
  val = analogRead(potPin); 
  digitalWrite(ledPin, HIGH); 
  delay(val); 
  digitalWrite(ledPin, LOW); 
  delay(val); 
  Serial.println(val);
}