byte led_red_pin = 11;
byte led_green_pin = 10;
byte led_blue_pin = 9;
byte led_pins[3] = {led_red_pin, led_green_pin, led_blue_pin};

int led_red_value = 0;
int led_green_value = 0;
int led_blue_value = 0;
int led_values[3] = {led_red_value, led_green_value, led_blue_value};

byte button_pin = 2;
bool button_read = false;
bool button_on = false;
bool switch0 = false;
unsigned long button_millis = 0;

void setup() {

  Serial.begin(9600);
  
  Serial.println("Setzen der LED OUTPUTS:");
  for (byte i = 0; i < 3; i++) {
    Serial.print("PIN: ");
    pinMode(led_pins[i], OUTPUT);
    Serial.print(led_pins[i]);
    Serial.println(" auf Output gesetzt.");
  }

  pinMode(button_pin, INPUT_PULLUP);
}

void loop() {

  unsigned long button_timer = millis() - button_millis;
  button_read = digitalRead(button_pin);

  if (button_read) {
    button_millis = millis();
  }

  if (!button_read && !button_on && button_timer > 20) {
    button_on = true;
  }

  if (button_read && button_on) {
    button_on = false;
    switch0 = !switch0;
  }


  if (switch0) {

    for (int i = 0; i < 255; i++) {
      led_values[0] = i;
      analogWrite(led_pins[0], led_values[0]);
      Serial.print("led_red: ");
      Serial.println(led_values[0]);
      delay(10);
      }
    led_values[0] = 255;
    analogWrite(led_pins[0], led_values[0]);
    Serial.println(led_values[0]);

    if (led_values[0] == 255) {
      for (int i = 0; i < 255; i++) {
        led_values[1] = i;
        analogWrite(led_pins[1], led_values[1]);
        Serial.print("led_green: ");
        Serial.println(led_values[1]);
        delay(10);
      }
      led_values[1] = 255;
      analogWrite(led_pins[1], led_values[1]);
      Serial.println(led_values[1]);
    }

    if (led_values[1] == 255) {
      for (int i = 255; i > 0; i--) {
        led_values[0] = i;
        analogWrite(led_pins[0], led_values[0]);
        Serial.print("led_red: ");
        Serial.println(led_values[0]);
        delay(10);
      }
      led_values[0] = 0;
      analogWrite(led_pins[0], led_values[0]);
      Serial.println(led_values[0]);
    }
    
    if (led_values[0] == 0) {
      for (int i = 0; i < 255; i++) {
        led_values[2] = i;
        analogWrite(led_pins[2], led_values[2]);
        Serial.print("led_blue: ");
        Serial.println(led_values[2]);
        delay(10);
      }
      led_values[2] = 255;
      analogWrite(led_pins[2], led_values[2]);
      Serial.println(led_values[2]);
    }

    if (led_values[2] == 255) {
      for (int i = 255; i > 0; i--) {
        led_values[1] = i;
        Serial.print("led_green: ");
        Serial.println(led_values[1]);
        delay(10);
      }
      led_values[1] = 0;
      analogWrite(led_pins[1], led_values[1]);
      Serial.println(led_values[1]);
    }

    if (led_values[1] == 0) {
      for (int i = 255; i > 0; i--) {
        led_values[2] = i;
        Serial.print("led_blue: ");
        Serial.println(led_values[2]);
        delay(10);
      }
      led_values[2] = 0;
      analogWrite(led_pins[2], led_values[2]);
      Serial.println(led_values[2]);
    }
  }
}