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

void setup() { 
  for( int p = 0; p < jml; p++ ){
    pinMode(lampu[p], OUTPUT);
  }

}

void loop() {
  for ( int p = 0; p < jml; p++ ){
    digitalWrite(lampu[p], 1);
    delay(100);
    digitalWrite(lampu[p], 0);
  } for ( int p = jml - 1; p > 0; p--) {
    digitalWrite(lampu[p], 1);
    delay(100);
    digitalWrite(lampu[p], 0);
  }

}