#include <LiquidCrystal.h>
#include <Keypad.h>

#define LCD_RS 12  
#define LCD_EN 11  
#define LCD_D7 A2
#define LCD_D6 A3   
#define LCD_D5 A4    
#define LCD_D4 A5    

#define LCD_COLUMNS 16   
#define LCD_ROWS 2    

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

LiquidCrystal lcd(LCD_RS, LCD_EN, LCD_D4, LCD_D5, LCD_D6, LCD_D7);

uint8_t colPins[COLS] = { 5, 4, 3, 2 }; 
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; 

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

void setup() {
  lcd.begin(LCD_COLUMNS, LCD_ROWS);
}

void loop() {

  char key = keypad.getKey();

  if (key != NO_KEY) {
    lcd.print(key);
  }
}