#include <Wire.h>
#include <LiquidCrystal_I2C.h>

// Initialize LCD (20x4)
LiquidCrystal_I2C lcd(0x27, 20, 4);

// Define custom characters for large numbers
byte leftSide[8]  = {0x07,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f,0x0f};
byte upperBar[8]  = {0x1f,0x1f,0x1f,0x00,0x00,0x00,0x00,0x00};
byte rightSide[8] = {0x1c,0x1e,0x1e,0x1e,0x1e,0x1e,0x1e,0x1c};
byte leftEnd[8]   = {0x0f,0x07,0x00,0x00,0x00,0x00,0x03,0x07};
byte lowerBar[8]  = {0x00,0x00,0x00,0x00,0x00,0x1f,0x1f,0x1f};
byte rightEnd[8]  = {0x1e,0x1c,0x00,0x00,0x00,0x00,0x18,0x1c};
byte middleBar[8] = {0x1f,0x1f,0x1f,0x00,0x00,0x00,0x1f,0x1f};
byte lowerEnd[8]  = {0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x0f};

void setup() {
  lcd.init();
  lcd.backlight();

  // Load custom characters into LCD memory
  lcd.createChar(0, leftSide);
  lcd.createChar(1, upperBar);
  lcd.createChar(2, rightSide);
  lcd.createChar(3, leftEnd);
  lcd.createChar(4, lowerBar);
  lcd.createChar(5, rightEnd);
  lcd.createChar(6, middleBar);
  lcd.createChar(7, lowerEnd);

  lcd.clear();
}

// Function to display large numbers (placed on lines 2 & 3)
void custom0(int x) {
  lcd.setCursor(x, 1); lcd.write(0); lcd.write(1); lcd.write(2);
  lcd.setCursor(x, 2); lcd.write(0); lcd.write(4); lcd.write(2);
}

void custom1(int x) {
  lcd.setCursor(x, 1); lcd.write(' '); lcd.write(2); lcd.write(' ');
  lcd.setCursor(x, 2); lcd.write(' '); lcd.write(2); lcd.write(' ');
}

void custom2(int x) {
  lcd.setCursor(x, 1); lcd.write(3); lcd.write(6); lcd.write(2);
  lcd.setCursor(x, 2); lcd.write(0); lcd.write(4); lcd.write(4);
}

void custom3(int x) {
  lcd.setCursor(x, 1); lcd.write(3); lcd.write(6); lcd.write(2);
  lcd.setCursor(x, 2); lcd.write(7); lcd.write(4); lcd.write(2);
}

void custom4(int x) {
  lcd.setCursor(x, 1); lcd.write(0); lcd.write(4); lcd.write(2);
  lcd.setCursor(x, 2); lcd.write(' '); lcd.write(' '); lcd.write(2);
}

void custom5(int x) {
  lcd.setCursor(x, 1); lcd.write(0); lcd.write(6); lcd.write(5);
  lcd.setCursor(x, 2); lcd.write(7); lcd.write(4); lcd.write(2);
}

void custom6(int x) {
  lcd.setCursor(x, 1); lcd.write(0); lcd.write(6); lcd.write(5);
  lcd.setCursor(x, 2); lcd.write(0); lcd.write(4); lcd.write(2);
}

void custom7(int x) {
  lcd.setCursor(x, 1); lcd.write(1); lcd.write(1); lcd.write(2);
  lcd.setCursor(x, 2); lcd.write(' '); lcd.write(2); lcd.write(' ');
}

void custom8(int x) {
  lcd.setCursor(x, 1); lcd.write(0); lcd.write(6); lcd.write(2);
  lcd.setCursor(x, 2); lcd.write(0); lcd.write(4); lcd.write(2);
}

void custom9(int x) {
  lcd.setCursor(x, 1); lcd.write(0); lcd.write(6); lcd.write(2);
  lcd.setCursor(x, 2); lcd.write(7); lcd.write(4); lcd.write(2);
}

// Function to print large numbers
void printNumber(int value, int col) {
  switch (value) {
    case 0: custom0(col); break;
    case 1: custom1(col); break;
    case 2: custom2(col); break;
    case 3: custom3(col); break;
    case 4: custom4(col); break;
    case 5: custom5(col); break;
    case 6: custom6(col); break;
    case 7: custom7(col); break;
    case 8: custom8(col); break;
    case 9: custom9(col); break;
  }
}

// Function to print 3-digit numbers
void print_bigletter(int dist) {
  lcd.clear();  // Clear previous numbers

  int hundreds = dist / 100;
  int tens = (dist / 10) % 10;
  int ones = dist % 10;

  if (hundreds > 0) {
    printNumber(hundreds, 4);
  } else {
    lcd.setCursor(4, 1);
    lcd.print(" ");  // Hide leading zero
  }

  printNumber(tens, 7);
  printNumber(ones, 10);
}

void loop() {
  for (int i = 0; i <= 999; i++) {  // Count up to 999
    print_bigletter(i);
    delay(200);
  }
}