// Define LED pin
const int LED_PIN = 13;

void setup() {
  pinMode(LED_PIN, OUTPUT); // Set LED pin as an output
}

void loop() {
  digitalWrite(LED_PIN, HIGH); // Turn LED on
  delay(1000); // Wait for 1 second
  digitalWrite(LED_PIN, LOW); // Turn LED off
  delay(1000); // Wait for 1 second
}