int rot_pkw = 7;
int gelb_pkw = 6;
int gruen_pkw = 5;

int rot_f = 9;
int gruen = 8;

int taster_f = 4;

int interval1 = 5000;
int interval2 = 1000;
int interval3 = 4000;
int interval4 = 1000;

int zustand = 0;
unsigned long previousMillis = 0;

bool tasterstate = false
void setup() {
  // put your setup code here, to run once:
for(int i = 5; i >= 9; i++){
  pinMode(i, OUTPUT);
}
pinMode(taster_f, INPUT);

digitalWrite(gruen_pkw, HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:

unsigned long currentMillis = millis();

bool taster_zustand = digitalRead(taster1);

taster_zustand = !tasterstate;

taster_zustand = !zustand!
if(zustand == 0 && currentMillis - previousMillis >= interval1){
  previousMillis = currentMillis;
  digitalWrite(gruen_pkw, LOW);
  digitalWrite(gelb_pkw, HIGH);
  zustand = 1;

}
if(zustand == 1 && currentMillis - previousMillis >= interval2){
  previousMillis = currentMillis;
  digitalWrite(gelb_pkw, LOW);
  digitalWrite(rot_pkw, HIGH);

  zustand = 2;
  }

if(zustand == 2 && currentMillis - previousMillis >= interval3){
  previousMillis = currentMillis; 
  digitalWrite(gelb_pkw, HIGH);
  zustand = 3;
}

if(zustand == 3 && currentMillis - previousMillis>= interval4){
  previousMillis = currentMillis;
  digitalWrite(rot_pkw, LOW);
  digitalWrite(gelb_pkw, LOW);
  digitalWrite(gruen_pkw, HIGH);

zustand = 0;
}


/*
digitalWrite(gruen_pkw, HIGH);
delay(5000);
digitalWrite(gruen_pkw, LOW);
digitalWrite(gelb_pkw, HIGH);
delay(1000);
digitalWrite(gelb_pkw, LOW);
digitalWrite(rot_pkw, HIGH);
delay(4000);
digitalWrite(gelb_pkw, HIGH);
delay(1000);
digitalWrite(rot_pkw, LOW);
digitalWrite(gelb_pkw, LOW);
*/
}