int buttonState;
int state = 0;
int buttonStateLOW = 0;
unsigned long ButtonDebonce;
unsigned long currentMillis = 0;
unsigned long startMillis = 0;

unsigned long timestamp;
const long anzeigedauer = 5000;


void setup()
{
 Serial.begin(9600);
 pinMode(8, INPUT_PULLUP);
 pinMode(4, OUTPUT);
 pinMode(5, OUTPUT);
}

void loop()
{
 currentMillis = millis();

  //Zähler 0-3
 buttonState = digitalRead(8);

 if (buttonState == LOW) {
   if (buttonStateLOW == 0)
     {
      buttonStateLOW = 1;
      ButtonDebonce = currentMillis;
      Serial.println("Button LOW, Start debunce");
     }
  }
  else
  {
   if (buttonStateLOW == 1)
     {
      if (currentMillis - ButtonDebonce > 100)
        {
         state++;
         startMillis = millis(); //zeit bei tastendruck speichern.
         if (state == 4)
           {
            state = 0;
           }
           Serial.println("Button HIGH, Inc state");
           Serial.println(state);
           //timestamp = currentMillis;
         }
         else
         {
          Serial.println("Button HIGH, Time to short");
         }
      buttonStateLOW = 0;
     }
   }

  //Ansteuerung von zwei LEDs
   switch (state)
  {
  case 0: //nix los
  Serial.println("state 0");
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  break;

  case 1: //taste
  Serial.println("state 1 hoch");
  if(millis() > startMillis+anzeigedauer)
    {
     state++;
    }
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  break;

  case 2: //timer oder taste aktivieren state 2
  Serial.println("state 2 off");
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  break;

  case 3:
  Serial.println("state 3 runter");
  if(millis() > startMillis+anzeigedauer)
    {
     state++;
    }
  digitalWrite(4, LOW);
  digitalWrite(4, HIGH);
  break;

  case 4:
  state=0;
  break;
  }
}