int ledPins[] = {5, 6, 7, 8, 9, 10, 11, 12};
int count;
int time =0;
int variable=255;

void setup()
{
	for(int i = 0; i < ledPins; i++) {           //set up all pins as OUTPUT
		pinMode(ledPins[i], OUTPUT);
	}
 
}

void loop() {
 
  for(int i = 0; i < 256; i++) 
  { 

   if(i==variable){
        signal( ledPins[0], ((i >> 0) % 2) == 1); 
        signal( ledPins[1], ((i >> 1) % 2) == 1); 
        signal( ledPins[2], ((i >> 2) % 2) == 1); 
        signal( ledPins[3], ((i >> 3) % 2) == 1);
        signal( ledPins[4], ((i >> 4) % 2) == 1);
        signal( ledPins[5], ((i >> 5) % 2) == 1);
        signal( ledPins[6], ((i >> 6) % 2) == 1);
        signal( ledPins[7], ((i >> 7) % 2) == 1);
    } 
    //delay(1000);
  }
}

  void signal(int ledPins, bool on) {
  if(on) {
    digitalWrite(ledPins, HIGH);
    delay(time);
  }
  else {
    digitalWrite(ledPins, LOW);
    delay(time);
  }
}