#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

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++) {
    switch (i) {
      case 0: 
        digitalWrite(LED9, HIGH); 
        digitalWrite(LED1, LOW); 
        break;
      case 1: 
        digitalWrite(LED8, HIGH); 
        digitalWrite(LED9, LOW); 
        break;
      case 2: 
        digitalWrite(LED7, HIGH); 
        digitalWrite(LED8, LOW); 
        break;
      case 3: 
        digitalWrite(LED6, HIGH); 
        digitalWrite(LED7, LOW); 
        break;
      case 4: 
        digitalWrite(LED5, HIGH); 
        digitalWrite(LED6, LOW); 
        break;
      case 5: 
        digitalWrite(LED4, HIGH); 
        digitalWrite(LED5, LOW); 
        break;
      case 6: 
        digitalWrite(LED3, HIGH); 
        digitalWrite(LED4, LOW);
        break;
      case 7: 
        digitalWrite(LED2, HIGH); 
        digitalWrite(LED3, LOW); 
        break;
      case 8: 
        digitalWrite(LED1, HIGH); 
        digitalWrite(LED2, LOW); 
        break;
    }
    
    Serial.print("An ");
    Serial.println(i);
    delay(100);
    if (i == 8) {
      digitalWrite(LED1, 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++) {
    switch (i) {
      case 0: 
        digitalWrite(LED9, HIGH);
        digitalWrite(LED1, LOW); 
        break;
      case 1: 
        digitalWrite(LED8, HIGH); 
        digitalWrite(LED9, LOW); 
        break;
      case 2: 
        digitalWrite(LED7, HIGH); 
        digitalWrite(LED8, LOW); 
        break;
      case 3: 
        digitalWrite(LED6, HIGH); 
        digitalWrite(LED7, LOW); 
        break;
      case 4: 
        digitalWrite(LED5, HIGH);   
        digitalWrite(LED6, LOW);  
        break;
      case 5:   
        digitalWrite(LED4, HIGH); 
        digitalWrite(LED5, LOW); 
        break;
      case 6: 
        digitalWrite(LED3, HIGH); 
        digitalWrite(LED4, LOW); 
        break;
      case 7: 
        digitalWrite(LED2, HIGH); 
        digitalWrite(LED3, LOW); 
        break;
      case 8: 
        digitalWrite(LED1, HIGH); 
        digitalWrite(LED2, LOW); 
        break;
    }
    
    Serial.print("An ");
    Serial.println(i);
    delay(100);
    if (i == 8) {
      digitalWrite(LED1, 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++) {
    switch (i) {
      case 0: 
        digitalWrite(LED9, HIGH); 
        digitalWrite(LED1, LOW); 
        break;
      case 1: 
        digitalWrite(LED8, HIGH); 
        digitalWrite(LED9, LOW); 
        break;
      case 2: 
        digitalWrite(LED7, HIGH); 
        digitalWrite(LED8, LOW); 
        break;
      case 3: 
        digitalWrite(LED6, HIGH); 
        digitalWrite(LED7, LOW); 
        break;
      case 4: 
        digitalWrite(LED5, HIGH); 
        digitalWrite(LED6, LOW); 
        break;
      case 5: 
        digitalWrite(LED4, HIGH); 
        digitalWrite(LED5, LOW); 
        break;
      case 6: 
        digitalWrite(LED3, HIGH); 
        digitalWrite(LED4, LOW); 
        break;
      case 7: 
        digitalWrite(LED2, HIGH); 
        digitalWrite(LED3, LOW); 
        break;
      case 8: 
        digitalWrite(LED1, HIGH); 
        digitalWrite(LED2, LOW); 
        break;
    }
    
    Serial.print("An ");
    Serial.println(i);
    delay(100);
    if (i == 8) {
      digitalWrite(LED1, LOW);
    }
  }
}