void setup() {
  // put your setup code here, to run once:
pinMode(21, OUTPUT);  //Ampel rot auto
pinMode(5,OUTPUT);    //Ampel gelb auto
pinMode(15, OUTPUT);  //Ampel grün auto  
pinMode(12,OUTPUT);   //Ampel rot Fußgänger
pinMode(13, OUTPUT);  //Ampel grün Fußgänger
}

void loop() {
digitalWrite(21, HIGH); //Ampel rot auto an
delay(200);
digitalWrite(13,HIGH); //Ampel grün Fußgänger aus

digitalWrite(5, HIGH); //Ampel rot gelb an
delay(200);
digitalWrite(13,LOW); //Ampel grün Fußgänger aus
delay(200);
digitalWrite(12, HIGH); //Ampel rot Fußgänger an
digitalWrite(21, LOW); //Ampel rot auto aus
delay(200);

digitalWrite(15, HIGH);
delay(200);
digitalWrite(12, LOW);
delay(200);
digitalWrite(15, LOW);
delay(200);

digitalWrite(5, LOW); //Ampel rot gelb aus
delay(200);
digitalWrite(5, LOW);
delay(200);

  // put your main code here, to run repeatedly:
  delay(200); // this speeds up the simulation
}