// Define the LED pin (usually pin 13 on most Arduino boards)
const int ledPin = 13;

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

void loop() {
  // Turn the LED on (HIGH is the voltage level)
  digitalWrite(ledPin, HIGH);
  // Wait for 1000 milliseconds (1 second)
  delay(1000);
  // Turn the LED off by making the voltage LOW
  digitalWrite(ledPin, LOW);
  // Wait for 1000 milliseconds (1 second)
  delay(1000);
}