const int OUT = LED_BUILTIN; // Ausgangs pin
const int TIME_ON = 5000;   //länge des Pulses
const int TIME_OFF = 10000; //zeit zwischen den Pulsen in MS 


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

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(OUT, HIGH);
  delay(TIME_ON);
  digitalWrite(OUT, LOW);
  delay(TIME_OFF);
}