#define LED_PIN 12  // GPIO pin where the LED is connected

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

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