int ledPin = 13;
int tasterPin = 14;

byte ledPins[] = {13,12,11,10,9,8,7,6,5,4,3,2};

const unsigned long verzoegerungsZeit = 80;

void setup() {
  Serial.begin(115200);
  Serial.println("Setup-Start");
  for (byte IndexNr = 0; IndexNr < 12;IndexNr++ ) {
    Serial.println(IndexNr);
    pinMode(ledPins[IndexNr], OUTPUT);
    digitalWrite(ledPins[IndexNr], HIGH);
    delay(500);
    digitalWrite(ledPins[IndexNr], HIGH);
  }
  pinMode(tasterPin, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(tasterPin) == LOW) {
    ledEinSequenz();
  } else {
    ledAusSequenz();
  }
}


void ledEinSequenz() {
  for (byte IndexNr = 0; IndexNr < 12; IndexNr++ ) {
    digitalWrite(ledPins[IndexNr], HIGH);
    delay(verzoegerungsZeit);
  }
}

void ledAusSequenz() {
  for (byte IndexNr = 0; IndexNr < 12; IndexNr++ ) {
    digitalWrite(ledPins[IndexNr], LOW);
    delay(verzoegerungsZeit);
  }
}