---

const int segPins[] = {2, 3, 4, 5, 6, 7, 8, 9};
const int digitPins[] = {10, 11, 12, 13};

const byte digitMasks[10] = {
  0b11111100,
  0b01100000,
  0b11011010,
  0b11110010,
  0b01100110,
  0b10110110,
  0b10111110,
  0b11100000,
  0b11111110,
  0b11110110
};

void setup() {
  for (int i = 0; i < 8; i++) {
    pinMode(segPins[i], OUTPUT);
  }
  
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
    digitalWrite(digitPins[i], LOW); 
  }
}

void loop() {
  for (int num = 0; num < 10; num++) {
    for (int s = 0; s < 8; s++) {
      bool bitVal = bitRead(digitMasks[num], 7 - s);
      digitalWrite(segPins[s], bitVal);
    }
    delay(1000);
  }
}