int merah1 = 1;
int kuning1 = 2;
int hijau1 = 3;
//lampu merah utara
int merah2 = 4;
int kuning2 = 5;
int hijau2 = 6;
//lampu merah barat
int merah3 = 7;
int kuning3 = 8;
int hijau3 = 9;
//lampu merah selatan

void setup() {
  // set pin sebagai output
  pinMode (1, OUTPUT);
  pinMode (2, OUTPUT);
  pinMode (3, OUTPUT);
  pinMode (4, OUTPUT);
  pinMode (5, OUTPUT);
  pinMode (6, OUTPUT);
  pinMode (7, OUTPUT);
  pinMode (8, OUTPUT);
  pinMode (9, OUTPUT);
}

void loop() {

  digitalWrite(hijau1, HIGH);
  digitalWrite(merah3, HIGH);
  digitalWrite(merah2, HIGH);
  delay(5000);
  digitalWrite(merah2, LOW);
  digitalWrite(hijau1, LOW);
  digitalWrite(kuning1, HIGH);
  digitalWrite(kuning2, HIGH);
  delay(2000);
  digitalWrite(kuning1, LOW);
  digitalWrite(kuning2, LOW);
  digitalWrite(merah1, HIGH);
  digitalWrite(hijau2, HIGH);
  delay(5000);
  digitalWrite(merah3, LOW);
  digitalWrite(hijau2, LOW);
  digitalWrite(kuning2, HIGH);
  digitalWrite(kuning3, HIGH);
  delay(2000);
  digitalWrite(kuning2,LOW);
  digitalWrite(kuning3, LOW);
  digitalWrite(hijau3, HIGH);
  digitalWrite(merah2, HIGH);
  delay(5000);
  digitalWrite(hijau3, LOW);
  digitalWrite(merah1, LOW);
  digitalWrite(kuning1, HIGH);
  digitalWrite(kuning3, HIGH);
  delay(2000);
  digitalWrite(kuning1, LOW);
  digitalWrite(kuning3, LOW);
}