#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
const int ROW_NUM = 4;
const int COLUMN_NUM = 4;

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

byte pin_rows[4]={9,8,7,6};
byte pin_column[4]={5,4,3,2};

Keypad keypad4x4 = Keypad(makeKeymap(keys),pin_rows,pin_column,ROW_NUM,COLUMN_NUM);

LiquidCrystal_I2C LCD(0x27,16,2);
void setup() 
{
 LCD.init();
 LCD.backlight();
LCD.clear();
}

void loop() 
{
  char key = keypad4x4.getKey();
  if(key);
  {
    LCD.setCursor(0,0);
    LCD.print("Key Pressed :");
    LCD.setCursor(8,1);
    LCD.print(key);
    delay(2000);
    
  }

}