const int Taster = 12;
const int LED = 2;
bool JA = false;
bool Schleife = false;
bool LEDSTATUS = true;
long unsigned int Zahl;

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(Taster, INPUT_PULLUP);
}

void loop() {
  if(digitalRead(Taster) == LOW){
    Schleife = true;
    Zahl = millis();

    while((digitalRead(Taster) == LOW) && (Schleife == true)){
      if(millis() - Zahl >= 5000){
        JA = true;
        Schleife = false;
      }
    }
  }

  if(JA == true){
    digitalWrite(LED, LEDSTATUS);
    LEDSTATUS = !LEDSTATUS;
    while(digitalRead(Taster) == LOW){
      delay(50);
    }
    JA = false;
  }

}