// Pin connected to the LED
const int ledPin = 13;
  // Setup function runs once the start 
void setup() {
  // Initialize the digital pin as an output 
  pinMode(ledPin, OUTPUT);
}
// Loop functuion runs repeatedly
void loop() {
  // Turn the LED on 
  digitalWrite(ledPin, HIGH);
  // Wait for 1 second
  delay(1000);
  // Turn the LED off
  digitalWrite(ledPin, LOW);
  // Wait for 1 second
  delay(1000);
}