const int LEDpins[8] = {12, 11, 10, 9, 8, 7, 6, 5};
void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(LEDpins[i], OUTPUT);
  }
  Serial.begin(9600);
}
void loop() {
  for (int number = 0; number < 256; number++) {
    Serial.print("Decimal: ");
    Serial.println(number);
    for (int i = 0; i < 8; i++) {
      digitalWrite(LEDpins[i], bitRead(number, i));
    }
    delay(500);
  }
}