// Pin definitions for segments (common to both displays)
int segPins[7] = {2, 3, 4, 5, 6, 7, 8}; // Pins connected to segments a-g

// Pin definitions for display control
int displayPins[2] = {9, 10};  // Pins for controlling common anode of the displays

// Lookup table for digits 0-9 using hexadecimal values for common anode displays
// Each entry in the array represents a digit with segment states a to g
byte digitLUT[10] = 
{
  0x3F,  // 0: 00111111 - segments a, b, c, d, e, f are on (LOW to turn on)
  0x06,  // 1: 00000110 - segments b, c are on
  0x5B,  // 2: 01011011 - segments a, b, d, e, g are on
  0x4F,  // 3: 01001111 - segments a, b, c, d, g are on
  0x66,  // 4: 01100110 - segments b, c, f, g are on
  0x6D,  // 5: 01101101 - segments a, c, d, f, g are on
  0x7D,  // 6: 01111101 - segments a, c, d, e, f, g are on
  0x07,  // 7: 00000111 - segments a, b, c are on
  0x7F,  // 8: 01111111 - all segments are on
  0x6F   // 9: 01101111 - segments a, b, c, d, f, g are on
};

// Function to display a digit using the hexadecimal lookup table
void displayDigit(int number, int displayIndex) {
  // Retrieve the hexadecimal pattern from the lookup table
  byte pattern = digitLUT[number];

  // Set the segment pins according to the binary pattern
  for (int i = 0; i < 7; i++) {
    digitalWrite(segPins[i], (pattern >> i) & 0x01 ? LOW : HIGH);
  }

  // Enable the selected display
  digitalWrite(displayPins[displayIndex], LOW);
  delay(5);  // Small delay to allow the display to show the number
  digitalWrite(displayPins[displayIndex], HIGH);  // Disable the display
}

void setup()
 {
  // Set segment pins as output
  for (int i = 0; i < 7; i++) {
    pinMode(segPins[i], OUTPUT);
  }

  // Set display control pins as output
  for (int i = 0; i < 2; i++) {
    pinMode(displayPins[i], OUTPUT);
    digitalWrite(displayPins[i], HIGH);  // Initially turn off all displays
  }
}

void loop() {
  // Loop through digits 0 to 9
  for (int i = 0; i < 10; i++) {
    // Display the digit on the first display
    displayDigit(i, 0);

    // Display the digit on the second display (same for demonstration)
    displayDigit(i, 1);

    delay(1000);  // Delay before the next cycle
  }
}