void setup(){
pinMode(2, OUTPUT); // Simpang satu, lampu hijau
pinMode(3, OUTPUT); // simpang satu, lampu kuning
pinMode(4, OUTPUT); // simpang satu, lampu merah
pinMode(5, OUTPUT); // simpang dua, lampu hijau
pinMode(6, OUTPUT); // simpang dua, lampu kuning
pinMode(7, OUTPUT); // simpang dua, lampu merah
pinMode(8, OUTPUT); // simpang tiga, lampu hijau
pinMode(9, OUTPUT); // simpang tiga, lampu kuning
pinMode(10, OUTPUT); // simpang tiga, lampu merah
pinMode(11, OUTPUT); // Simpang empat, lampu hijau
pinMode(12, OUTPUT); // simpang empat, lampu kuning
pinMode(13, OUTPUT); // simpang empat, lampu merah
}

void loop(){
  // put your main code here, to run repeatedly:
simpang_satu(); // seting simpang 1
simpang_dua(); // seting simpang 2
simpang_tiga(); // seting simpang 3
simpang_empat(); // seting simpang 4
}

void simpang_satu(){
  digitalWrite(4, HIGH); // lampu merah hidup
  delay(3000); // selama 3 detik
  digitalWrite(4, LOW); // lampu merah mati
  digitalWrite(3, HIGH); // lampu kuning hidup
  delay(1000); // selama 1 detik
  digitalWrite(3, LOW); // lampu kuning mati
  digitalWrite(2, HIGH); // lampu hijau hidup
  delay(5000); // selama 5 detik
  digitalWrite(2, LOW); // lampu hijau mati
  digitalWrite(4, HIGH);
}

void simpang_dua(){
  digitalWrite(7, HIGH);
  delay(3000);
  digitalWrite(7, LOW);
  digitalWrite(6, HIGH);
  delay(1000);
  digitalWrite(6, LOW);
  digitalWrite(5, HIGH);
  delay(5000);
  digitalWrite(5, LOW);
  digitalWrite(7, HIGH);
}

void simpang_tiga(){
  digitalWrite(10, HIGH);
  delay(3000);
  digitalWrite(10, LOW);
  digitalWrite(9, HIGH);
  delay(1000);
  digitalWrite(9, LOW);
  digitalWrite(8, HIGH);
  delay(5000);
  digitalWrite(8, LOW);
  digitalWrite(10, HIGH);
}

void simpang_empat(){
  digitalWrite(13, HIGH);
  delay(3000);
  digitalWrite(13, LOW);
  digitalWrite(12, HIGH);
  delay(1000);
  digitalWrite(12, LOW);
  digitalWrite(11, HIGH);
  delay(5000);
  digitalWrite(11, LOW);
  digitalWrite(13, HIGH);
}