/* (Straight Keys)
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>

const int ROW_NUM    = 4; // four rows
const int COLUMN_NUM = 4; // four columns

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
};

byte pin_rows[ROW_NUM] = {9, 8, 7, 6};      // connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; // connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
LiquidCrystal_I2C lcd(0x27, 17, 2); // I2C address 0x27, 16 column and 2 rows

int cursorColumn = 0;

void setup(){
  lcd.init(); // initialize the lcd
  lcd.backlight();
}

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

    lcd.setCursor(0, 0);
    lcd.print("   Numeric Keypad");


  if (key) {
    
    lcd.setCursor(cursorColumn, 2); // move cursor to   (cursorColumn, 0)
    lcd.print(key);                 // print key at (cursorColumn, 0)

    cursorColumn++;                 // move cursor to next position
    if(cursorColumn == 17) {        // if reaching limit, clear LCD
      lcd.clear();
      cursorColumn = 0;
    }
  }
}*/

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

// Initialize the I2C LCD
LiquidCrystal_I2C lcd(0x27, 20, 4);  // Change 0x27 to your LCD's I2C address

// Define the Keypad
const byte ROWS = 4; // Four rows
const byte COLS = 4; // Four columns
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6};    // Connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2};    // Connect to the column pinouts of the keypad

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

void setup() {
  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  
    lcd.setCursor(0, 0);
    lcd.print("   Numeric Keypad");

  lcd.setCursor(0, 1);
  lcd.print("Keypad Input:");

  // Print an initial message on the LCD
  lcd.setCursor(0, 2);
  lcd.print("Press a key...");
}

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

  if (key) {
    // When a key is pressed, clear the current line and display the key
    lcd.setCursor(0, 3);
    lcd.print("Key Pressed: ");
    lcd.print(key);
  }
}