#include <Keypad.h>
#include <LiquidCrystal_I2C.h> // Include the LiquidCrystal_I2C library

// Define LCD connections
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16x2 display

const byte ROWS = 4; // Number of rows
const byte COLS = 4; // Number of columns
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {A0, A1, A2, A3}; // Connect to row pins
byte colPins[COLS] = {A4, A5, 2, 3}; // Connect to column pins

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String inputValue = "";

void setup() {
  // Initialize the LCD
  lcd.init();
  lcd.backlight(); // Turn on the backlight

  // Print initial message
  lcd.setCursor(0, 0);
  lcd.print("Enter: ");
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    if (key == '#') {
      // If '#' is pressed, clear the input value
      inputValue = "";
    } else {
      // Append the pressed key to the input value
      inputValue += key;
    }

    // Display the input value on the LCD
    lcd.setCursor(7, 0); // Move cursor to the second row
    lcd.print("      "); // Clear the previous input
    lcd.setCursor(7, 0); // Move cursor to the second row
    lcd.print(inputValue);

    delay(200); // Add a small delay to debounce the keypad
  }
}