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

const int rs = 15, en = 4, d4 = 18, d5 = 19, d6 = 21, d7 = 22;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
const byte ROWS = 4; 
const byte COLS = 4; 
char hexaKeys[ROWS][COLS] = { 

{'1', '2', '3', 'A'}, 
{'4', '5', '6', 'B'}, 
{'7', '8', '9', 'C'}, 
{'*', '0', '#', 'D'} 
}; 

byte rowPins[ROWS] = {26, 27, 2, 5}; 
byte colPins[COLS] = {13, 12, 34, 35};
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

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

void loop() {
char customKey = customKeypad.getKey();
lcd.write(Serial.read()); 
if (customKey) {
Serial.println(customKey);
lcd.clear();
 }
}