// Set up pin numbers
int ledPin = 13; // This is the digital pin connected to the resistor and LED

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

void loop() {
  // Turn on the LED
  digitalWrite(ledPin, HIGH);
  delay(1000); // Keep it on for 1 second (1000 milliseconds)
  
  // Turn off the LED
  digitalWrite(ledPin, LOW);
  delay(1000); // Keep it off for 1 second
}