#include <RTClib.h>
#include <Wire.h>

// Define pins for each LED column
const int leds[][4] = {
  {22, 23},       // Hours, 2 LEDs
  {24, 25, 26, 27},  // Hours, 4 LEDs
  {28, 29, 30},    // Minutes, 3 LEDs
  {31, 32, 33, 34},  // Minutes, 4 LEDs
  {35, 36, 37},      // Seconds, 3 LEDs
  {38, 39, 40, 41}   // Seconds, 4 LEDs
};

// Define pins for BCD input (4 bits for hours, 6 bits for minutes, and 6 bits for seconds)
const int hourPins[] = {22, 23, 24, 25};
const int minutePins[] = {26, 27, 28, 29, 30, 31};
const int secondPins[] = {32, 33, 34, 35, 36, 37};

void setup() {
  // Set LED pins as OUTPUT
  for (int i = 0; i < 6; i++) {
    for (int j = 0; j < sizeof(leds[0]) / sizeof(leds[0][0]); j++) {
      pinMode(leds[i][j], OUTPUT);
    }
  }

  // Set BCD input pins as INPUT
  for (int i = 0; i < 4; i++) {
    pinMode(hourPins[i], INPUT);
  }
  for (int i = 0; i < 6; i++) {
    pinMode(minutePins[i], INPUT);
    pinMode(secondPins[i], INPUT);
  }

  // Initialize Serial communication
  Serial.begin(9600);
}

void loop() {
  // Read BCD values for hours, minutes, and seconds
  int hours = readBCD(hourPins);
  int minutes = readBCD(minutePins);
  int seconds = readBCD(secondPins);

  // Display BCD values on LEDs
  displayBCD(hours, 0, 2);    // Display hours using the first column (2 LEDs)
  displayBCD(hours, 2, 4);    // Display hours using the second column (4 LEDs)
  delay(1000);  // Wait for 1 second

  displayBCD(minutes, 4, 3);  // Display minutes using the third column (3 LEDs)
  displayBCD(minutes, 7, 4);  // Display minutes using the fourth column (4 LEDs)
  delay(1000);  // Wait for 1 second

  displayBCD(seconds, 10, 3); // Display seconds using the fifth column (3 LEDs)
  displayBCD(seconds, 13, 4); // Display seconds using the sixth column (4 LEDs)
  delay(1000);  // Wait for 1 second

  // Print the time to the Serial Monitor
  Serial.print("Time: ");
  Serial.print(hours);
  Serial.print(":");
  if (minutes < 10) {
    Serial.print("0");
  }
  Serial.print(minutes);
  Serial.print(":");
  if (seconds < 10) {
    Serial.print("0");
  }
  Serial.println(seconds);
}

int readBCD(const int pins[]) {
  int value = 0;
  for (int i = 0; i < sizeof(pins) / sizeof(pins[0]); i++) {
    value |= digitalRead(pins[i]) << i;
  }
  return value;
}

void displayBCD(int value, int startLED, int numLEDs) {
  // Display BCD value on LEDs
  for (int i = 0; i < numLEDs; i++) {
    digitalWrite(leds[startLED][i], (value >> (3 - i)) & 0x01); // Adjusted for row-wise binary representation
  }
}