int ledPins[] = {22, 23, 24, 25, 26, 27, 28, 29};
int ledCount = 8; 

void setup() {
  for (int i = 0; i < ledCount; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  // nyalakan LED dari kiri ke kanan
  for (int i = 0; i < ledCount; i++) {
    digitalWrite(ledPins[i], HIGH); 
    delay(200);                      
    digitalWrite(ledPins[i], LOW);   
  }
  // nyalakan LED dari kanan ke kiri
  for (int i = ledCount - 1; i >= 0; i--) {
    digitalWrite(ledPins[i], HIGH);  
    delay(200);                      
    digitalWrite(ledPins[i], LOW);  
  }
}