//#define LED_BUILTIN 13

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN)); // Toggle the LED state
  delay(1000); // Wait for 1 second
}