int merah1 = 13;
int kuning1 = 12;
int hijau1 = 11;

int merah2 = 10;
int kuning2 = 9;
int hijau2 = 8;

int merah3 = 7;
int kuning3 = 6;
int hijau3 = 5;

int merah4 = 4;
int kuning4 = 3;
int hijau4 = 2;


void setup() {
  // put your setup code here, to run once:
  pinMode(merah1, OUTPUT); // merah 1
  pinMode(kuning1, OUTPUT); // kuning 1
  pinMode(hijau1, OUTPUT); // hijau
  pinMode(merah2, OUTPUT); // merah 1
  pinMode(kuning2, OUTPUT); // kuning 1
  pinMode(hijau2, OUTPUT); // hijau
  pinMode(merah3, OUTPUT); // merah 1
  pinMode(kuning3, OUTPUT); // kuning 1
  pinMode(hijau3, OUTPUT); // hijau
  pinMode(merah4, OUTPUT); // merah 1
  pinMode(kuning4, OUTPUT); // kuning 1
  pinMode(hijau4, OUTPUT); // hijau
}

void loop() {
  // put your main code here, to run repeatedly:
  
  digitalWrite(merah1, LOW);
  digitalWrite(kuning1, LOW);
  digitalWrite(hijau1, HIGH);

  digitalWrite(merah2, HIGH);
  digitalWrite(kuning2, LOW);
  digitalWrite(hijau2, LOW);

  digitalWrite(merah3, HIGH);
  digitalWrite(kuning3, LOW);
  digitalWrite(hijau3, LOW);

  digitalWrite(merah4, HIGH);
  digitalWrite(kuning4, LOW);
  digitalWrite(hijau4, LOW);
  delay(1000);

  digitalWrite(merah1, LOW);
  digitalWrite(kuning1, HIGH);
  digitalWrite(hijau1, LOW);

  digitalWrite(merah2, HIGH);
  digitalWrite(kuning2, HIGH);
  digitalWrite(hijau2, LOW);

  digitalWrite(merah3, HIGH);
  digitalWrite(kuning3, LOW);
  digitalWrite(hijau3, LOW);

  digitalWrite(merah4, HIGH);
  digitalWrite(kuning4, LOW);
  digitalWrite(hijau4, LOW);
  delay(1000);
  
}