// Define the pin number for LED
int ledPin = 13;

// Set up function to initialize LED pin
void setup() {
  // Initialize the digital pin as output
pinMode(ledPin, OUTPUT);
}

// Loop function to blink the LED
void loop() {
  // Turn the LED on (HIGH is the voltage level)
digitalWrite(ledPin, HIGH);
// Wait for a second
delay(1000);
// Turn the LED off
digitalWrite(ledPin, LOW);
// Wait for a second
delay(1000);
}