#define LED_TEST       4
#define TIME_BLINK     1000

void setup() {
  Serial.begin(115200);
  Serial.println("Projekt: Lass mal eine LED blinken");
  pinMode(LED_TEST, OUTPUT);
}

void loop() {
  digitalWrite(LED_TEST, HIGH);
  delay(TIME_BLINK);
  digitalWrite(LED_TEST, LOW);
  delay(TIME_BLINK);
}