// Pin number for LED
int ledPin = 13;

void setup() {
 // Initialize LED pin as output
  pinMode(ledPin, OUTPUT);
  }

  void loop() {
   digitalWrite(ledPin, HIGH); // Turn LED ON
    delay(1000);                // Wait 1 second
     digitalWrite(ledPin, LOW);  // Turn LED OFF
      delay(1000);                // Wait 1 second
      }