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

const int ROW_NUM = 4; //four rows
const int COLUMN_NUM = 4; //four columns
const int rs=13, en =12, d4 = 11, d5 =10,d6 =9, d7=8;

LiquidCrystal lcd(rs,en,d4,d5,d6,d7);

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] = {7, 6, 5, 4}; //connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {3, 2, A1, A2}; //connect to the column pinouts of the keypad

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

void setup(){
  Serial.begin(9600);
  lcd.begin(16,2);
}

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

  if (key){
    Serial.println(key);
    lcd.print(key) ;
  }
}