// Define segment pins
const int segmentPins[8] = {2, 3, 4, 5, 6, 7, 8, 9}; // a, b, c, d, e, f, g, dp

// Define digit control pins
const int digitPins[4] = {10, 11, 12, 13}; // DIG1, DIG2, DIG3, DIG4

// Digit patterns for 0-9
const byte digitPatterns[10] = {
  B00111111, // 0
  B00000110, // 1
  B01011011, // 2
  B01001111, // 3
  B01100110, // 4
  B01101101, // 5
  B01111101, // 6
  B00000111, // 7
  B01111111, // 8
  B01101111  // 9
};

void setup() {
  // Initialize segment pins as outputs
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT);
    digitalWrite(segmentPins[i], HIGH); // Turn off all segments (common anode)
  }

  // Initialize digit control pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
    digitalWrite(digitPins[i], LOW); // Turn off all digits (common anode)
  }
}

void loop() {
  int number = 2222; // The number to display

  for (int i = 0; i < 4; i++) {
    displayDigit(number % 10, i);
    number /= 10;
  }
}

void displayDigit(int digit, int position) {
  // Turn on the corresponding digit
  digitalWrite(digitPins[position], HIGH);

  // Set the segments for the digit
  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], (digitPatterns[digit] >> i) & 0x01 ? LOW : HIGH);
  }

  // Delay for multiplexing
  delay(2);

  // Turn off the digit
  digitalWrite(digitPins[position], LOW);
}