int LED[] = {2,3,4,5};
int Potensio = A0;

void setup() {
  pinMode(Potensio, INPUT);

  for (int i = 0; i <= ((sizeof(LED)/2) - 1); i++){
    pinMode(LED[i],OUTPUT);
  }

  Serial.begin(115200);
}

void mati_all(){
  for (int i = 0; i <= ((sizeof(LED)/2) - 1); i++){
    digitalWrite(LED[i],LOW);
  }
}

void loop() {
  int potess = map(analogRead(Potensio), 0, 1023, 0, 1000);
  mati_all();
  if ((potess >= 490) && (potess <= 510)){
    Serial.print("Tengah ");
    Serial.println(potess);
  }
  
  else if (potess > 510){
    potess = map(potess, 500, 1000, 500, 10);
    Serial.print("Kanan ");
    Serial.println(potess);

    for (int i = 0; i <= ((sizeof(LED)/2) - 1); i++){
      digitalWrite(LED[i],HIGH);
      delay(potess);
      digitalWrite(LED[i],LOW);
    }
  }

  else if (potess < 490){
    potess = map(potess, 0, 500, 10, 500);
    Serial.print("Kiri ");
    Serial.println(potess);

    for (int i = ((sizeof(LED)/2) - 1); i >= 0; i--){
      digitalWrite(LED[i],HIGH);
      delay(potess);
      digitalWrite(LED[i],LOW);
    }  
  }

}