int port[]={0,1,2,3,4,5,6,7};
int jml=8, timer=100, i;
void setup() {
  for(i=0;i<8;i++){
    pinMode(port[i], OUTPUT);
  }
}

void loop() {
 // digitalWrite(1, LOW);
  for(i=0;i<8;i++){
    digitalWrite(port[i], HIGH);
    delay(timer);
  }

  for(i=0;i<8;i++){
    digitalWrite(port[i], LOW);
    delay(timer);
  }

}