// Define segment pins (Common Cathode)
const int segmentPins[] = {22, 23, 24, 25, 26, 27, 28, 29}; 
const int digitSelectPins[] = {30, 31}; // Left (Tens) and Right (Ones) Display

// 7-segment encoding for 0-9 (Common Cathode)
const byte digitPatterns[] = {
  0b00111111, // 0
  0b00000110, // 1
  0b01011011, // 2
  0b01001111, // 3
  0b01100110, // 4
  0b01101101, // 5
  0b01111101, // 6
  0b00000111, // 7
  0b01111111, // 8
  0b01101111  // 9
};

void setup() {
  // Set segment pins as OUTPUT
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }
  
  // Set digit select pins as OUTPUT
  pinMode(digitSelectPins[0], OUTPUT);
  pinMode(digitSelectPins[1], OUTPUT);
}

void loop() {
  int tens, ones;
  
  while (1) {  // Infinite loop to cycle from 00 to 99
    for (tens = 0; tens <= 9; tens++) {  // Loop for tens digit (Left Display)
      for (ones = 0; ones <= 9; ones++) {  // Loop for ones digit (Right Display)
        for (int i = 0; i < 50; i++) {  // Multiplexing refresh loop
          
          // Activate Left Display (Tens place)
          digitalWrite(digitSelectPins[0], HIGH);
          digitalWrite(digitSelectPins[1], LOW);
          
          for (int j = 0; j < 8; j++) {
            digitalWrite(segmentPins[j], (digitPatterns[tens] >> j) & 0x01);
          }
          
          delay(5); // Small delay for persistence of vision
          
          // Activate Right Display (Ones place)
          digitalWrite(digitSelectPins[0], LOW);
          digitalWrite(digitSelectPins[1], HIGH);
          
          for (int j = 0; j < 8; j++) {
            digitalWrite(segmentPins[j], (digitPatterns[ones] >> j) & 0x01);
          }
          
          delay(5); // Small delay for persistence of vision
        }
      }
    }
  }
}