// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.  
	pinMode(LED_BUILTIN, OUTPUT);
}
// the loop function runs over and over again forever
void loop() {
	  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on   
	  delay(1000);                       // wait for a second  
	  digitalWrite(LED_BUILTIN, LOW);   // turn the LED off with LOW voltage   
          delay(1000);  
}