//const int ledMerah = 14;
//const int ledKuning = 12;
//const int ledHijau = 13;
int LED[] = {0, 14, 12, 13};
int j;
bool kanan;

void setup() {
    //pinMode(LED[1], OUTPUT);
    //pinMode(LED[2], OUTPUT);
    //pinMode(LED[3], OUTPUT);
  for (int i = 1; i < 13; i++) {
    pinMode(LED[i], OUTPUT);
  }
  j=1;
  kanan=true;
}

void loop() {
  if(kanan){
    digitalWrite(LED[j], HIGH);
    if(j>1){
      digitalWrite(LED[j-1], LOW);  
    }
    j++;
    if (j==4){
      kanan=false;
      j=3;
    }
    delay(1000);
  }
  else {
    digitalWrite(LED[j], LOW);
    if (j>1){
      digitalWrite(LED[j-1], HIGH);
    }
    j--;
    if (j==1){
      kanan=true;
      j=2;
    }
    delay(1000);
  }
/*    digitalWrite(LED[1], HIGH);
    delay(500);
    digitalWrite(LED[1], LOW);
    digitalWrite(LED[2], HIGH);
    delay(500);
    digitalWrite(LED[2], LOW);
    digitalWrite(LED[3], HIGH);
    delay(500);
    digitalWrite(LED[3], LOW);
    digitalWrite(LED[2], HIGH);
    delay(500);
    digitalWrite(LED[2], LOW);
*/
}