const int BIT_PINS[3] = {10, 9, 8};  // LSB to MSB
const int EN_PIN = 11;
const int EN_A_SEG_PIN = 12;
const unsigned long ONE_SEC = 1000;
const byte SEG_NUMBERS[] = {
  0b00111111, // 0
  0b00000110, // 1
  0b01011011, // 2
  0b01001111, // 3
  0b01100110, // 4
  0b01101101, // 5
  0b01111101, // 6
  0b00000111, // 7
  0b01111111, // 8
  0b01101111  // 9
};

unsigned long prevTime = 0;
int number = 0;

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

void loop() {
  if (millis() - prevTime >= ONE_SEC)  {
    prevTime = millis();
    number++;
    if (number == 10) number = 0;
  }
  if (number == 1 || number == 4) {
    digitalWrite(EN_A_SEG_PIN, LOW);
  } else  {
    digitalWrite(EN_A_SEG_PIN, HIGH);
  }
  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
                   && bitRead(SEG_NUMBERS[number], count));
    }
    digitalWrite(EN_PIN, HIGH); // unblank
    //delay(50);
  }
}