// Knight Rider
int led[8] = {2, 3, 4, 5, 6, 7, 8, 9};

void setup() {  
  Serial.begin(9600);
  for (int i=0; i<8; i++) {
    pinMode(led[i], OUTPUT);
  }
}

void loop() {
  for (int i=0; i<8; i++) {
    Serial.print("Wert ist ");
    Serial.println(i);
    digitalWrite(led[i], HIGH);
    delay(500);
    digitalWrite(led[i], LOW);
  }

  for (int i=7; i>=0; i--) {
    Serial.print("Wert ist ");
    Serial.println(i);
    digitalWrite(led[i], HIGH);
    delay(500);
    digitalWrite(led[i], LOW);
  }
}