#include <Keypad.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,14,15,16,17);

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'}
};

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

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

void setup(){
  lcd.begin(16,2);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Keypad key");

}

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

  if(key !=NO_KEY){
    Serial.println(key); 
    lcd.setCursor(0,1),
    lcd.print(key);
  }
}