// Dimas Atha Putra (230605110052)
//
int pinLED = 8;
int timeDelay = 250;

void setup() {
  // put your setup code here, to run once:
  for (int i = 8; i <= 11; i++) {
    pinMode(i, OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:  
  for (int i = 8; i <= 11; i++) {
    digitalWrite(i, HIGH);
    delay(timeDelay);
  }

  for (int i = 11; i >= 8; i--) {
    digitalWrite(i, LOW);
    delay(timeDelay);
  }
}