const int BIT_PINS[3] = {10, 9, 8};  // LSB to MSB
const int EN_PIN = 11;

void setup() {
  for (int i = 0; i < 3; i++) {
    pinMode(BIT_PINS[i], OUTPUT);
  }
  pinMode(EN_PIN, OUTPUT);
}

void loop() {
  for (int count = 0; count < 8; count++) { // count 0 - 7
    digitalWrite(EN_PIN, LOW);  // blank whilst bit shuffling
    for (int pin = 0; pin < 3; pin++) { // 3 bits, 0 - 2
      digitalWrite(BIT_PINS[pin], (count >> pin) & 1);
    }
    digitalWrite(EN_PIN, HIGH); // unblank
    delay(1000);
  }
}