void setup() {
  // inisialisasi ayau pengenalan pin

  //utara
  pinMode(1, OUTPUT); // pin 1 itu merah
  pinMode(2, OUTPUT); //pin 2 itu kuning
  pinMode(3, OUTPUT); //pin 3 itu hijau

  //selatan
  pinMode(4, OUTPUT); // merah
  pinMode(5, OUTPUT); //kuning
  pinMode(6, OUTPUT); //hijau
} 

void Utara_Hijau()
{
  //utara
 digitalWrite(3, HIGH);
 digitalWrite(2, LOW);
 digitalWrite(1, LOW);

  //selatan
  digitalWrite(4, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);

  delay(5000); //delay 5 detik
}

void Utara_Kuning()
{
  //utara
 digitalWrite(3, LOW);
 digitalWrite(2, HIGH);
 digitalWrite(1, LOW);

  //selatan
  digitalWrite(4, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(6, LOW);

  delay(2000); //delay 2 detik
}

void Selatan_Hijau()
{
  //utara
 digitalWrite(3, LOW);
 digitalWrite(2, LOW);
 digitalWrite(1, HIGH);

  //selatan
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);
  digitalWrite(6, HIGH);

  delay(2000); //delay 2 detik
}

void Selatan_Kuning()
{
  //utara
 digitalWrite(3, LOW);
 digitalWrite(2, LOW);
 digitalWrite(1, HIGH);

  //selatan
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(6, LOW);

  delay(2000); //delay 2 detik
}


void loop()
{
   Utara_Hijau();
   Utara_Kuning(); //hati-hati
   Selatan_Kuning(); //siap-siap
   Selatan_Hijau();
   Selatan_Kuning(); //hati-hati
   Utara_Kuning(); //siap-siap
}