#define CAR_RED 5
#define CAR_YELLOW 6
#define CAR_GREEN 7

#define PED_RED 3
#define PED_GREEN 4

#define PED_KEY 2

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode ( CAR_RED, OUTPUT);
  pinMode ( CAR_YELLOW, OUTPUT);
  pinMode ( CAR_GREEN, OUTPUT);
  pinMode ( PED_RED, OUTPUT);
  pinMode ( PED_GREEN, OUTPUT);
  pinMode ( PED_KEY, INPUT_PULLUP);
}

void car_green_ped_red() {
  // KFZ grün, Fussgaenger rot
  digitalWrite ( CAR_RED, LOW );
  digitalWrite ( CAR_YELLOW, LOW );
  digitalWrite ( CAR_GREEN, HIGH );
  digitalWrite ( PED_RED, HIGH );
  digitalWrite ( PED_GREEN, LOW );
}

void car_yellow_ped_red() {
    // KFZ gelb, Fussgaenger rot
    digitalWrite ( CAR_RED, LOW );
    digitalWrite ( CAR_YELLOW, HIGH );
    digitalWrite ( CAR_GREEN, LOW );
    digitalWrite ( PED_RED, HIGH );
    digitalWrite ( PED_GREEN, LOW );
}

void car_red_ped_red() {
    // KFZ rot, Fussgaenger rot
    digitalWrite ( CAR_RED, HIGH );
    digitalWrite ( CAR_YELLOW, LOW );
    digitalWrite ( CAR_GREEN, LOW );
    digitalWrite ( PED_RED, HIGH );
    digitalWrite ( PED_GREEN, LOW );
}

void car_red_ped_green () {
    // KFZ rot, Fussgaenger gruen
    digitalWrite ( CAR_RED, HIGH );
    digitalWrite ( CAR_YELLOW, LOW );
    digitalWrite ( CAR_GREEN, LOW );
    digitalWrite ( PED_RED, LOW );
    digitalWrite ( PED_GREEN, HIGH );

}

void car_red_yellow_ped_red () {
      // KFZ rot-gelb, Fussgaenger rot
    digitalWrite ( CAR_RED, HIGH );
    digitalWrite ( CAR_YELLOW, HIGH );
    digitalWrite ( CAR_GREEN, LOW );
    digitalWrite ( PED_RED, HIGH );
    digitalWrite ( PED_GREEN, LOW );
}

void loop () {
  car_green_ped_red();
  if ( digitalRead ( PED_KEY ) == LOW ) {
    car_yellow_ped_red();
    delay ( 1000 );
    car_red_ped_red();
    delay ( 3000 );
    car_red_ped_green();
    delay ( 3000 );
    car_red_ped_red();
    delay ( 1000 );
    car_red_yellow_ped_red ();
    delay ( 1000 );  
  }
}