/*
   an den PINs 2-9 sind LEDs angeschlossen
*/
int pinArray[] = {2, 3, 4, 5, 6, 7, 8, 9};
int zaehler = 0;
int dauer = 33;

void setup() {
  for (zaehler = 0; zaehler < 8; zaehler++) {
    pinMode(pinArray[zaehler], OUTPUT);
  }
}

void loop() {
  for (zaehler = 0; zaehler < 7; zaehler++) {
    digitalWrite(pinArray[zaehler], HIGH);
    delay(dauer);
    digitalWrite(pinArray[zaehler], LOW);
    delay(dauer);
  }
  for (zaehler = 7; zaehler >= 0; zaehler--) {
    digitalWrite(pinArray[zaehler], HIGH);
    delay(dauer);
    digitalWrite(pinArray[zaehler], LOW);
    delay(dauer);
  }
}