#define LED9 4
#define LED8 5
#define LED7 6

#define LED6 15
#define LED5 16
#define LED4 17

#define LED3 10
#define LED2 11
#define LED1 12

#define GND1 1
#define GND2 2
#define GND3 42

int arraytest[] = {LED9, LED8, LED7, LED6, LED5, LED4, LED3, LED2, LED1};

void setup() {
  pinMode(GND1, OUTPUT);
  pinMode(GND2, OUTPUT);
  pinMode(GND3, OUTPUT);


  pinMode(LED9, OUTPUT);
  pinMode(LED8, OUTPUT);
  pinMode(LED7, OUTPUT);

  pinMode(LED6, OUTPUT);
  pinMode(LED5, OUTPUT);
  pinMode(LED4, OUTPUT);

  pinMode(LED3, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED1, OUTPUT);
}

void loop() {
  digitalWrite(GND1, LOW); //Schicht 1
  digitalWrite(GND2, HIGH); //Schicht 2
  digitalWrite(GND3, HIGH); //Schicht 3

  // Erste Schicht
  for (int i = 0; i < 9; i++) {
    digitalWrite(arraytest[i], HIGH);
    digitalWrite(arraytest[i-1],LOW);
    
    Serial.print("An ");
    Serial.println(i);
    delay(100);
    if (i == 8) {
      digitalWrite(arraytest[i],LOW);
    }
  }

  // Schicht 2 nur an
  digitalWrite(GND1, HIGH); //Schicht 1
  digitalWrite(GND2, LOW); //Schicht 2
  digitalWrite(GND3, HIGH); //Schicht 3

  // Zweite Schicht
  for (int i = 0; i < 9; i++) {
    digitalWrite(arraytest[i], HIGH);
    digitalWrite(arraytest[i-1],LOW);
    
    Serial.print("An ");
    Serial.println(i);
    delay(100);
    if (i == 8) {
      digitalWrite(arraytest[i],LOW);
    }
  }

  // Schicht 3 nur an
  digitalWrite(GND1, HIGH); //Schicht 1
  digitalWrite(GND2, HIGH); //Schicht 2
  digitalWrite(GND3, LOW); //Schicht 3
  
  // Dritte schicht
  for (int i = 0; i < 9; i++) {
    digitalWrite(arraytest[i], HIGH);
    digitalWrite(arraytest[i-1],LOW);
    
    Serial.print("An ");
    Serial.println(i);
    delay(100);
    if (i == 8) {
      digitalWrite(arraytest[i],LOW);
    }
  }
}