void setup() {
  // put your setup code here, to run once:
   pinMode(LED_BUILTIN, OUTPUT);
 digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:

}