#include<LiquidCrystal.h>
#include <Keypad.h>
char keys[4][4] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
};

byte pin_rows[4] = {7, 6, 5, 4}; //connect to the row of the keypad
byte pin_column[4] = {3, 2, 8, 9}; //connect to the column of the keypad

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, 4, 4 );

LiquidCrystal lcd(21, 20, 19, 18, 17, 16);// rs, en, d4,d5,d6,d7 

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

void loop()
{
  char key = keypad.getKey();
 
  if (key){
     Serial.println(key);
    lcd.setCursor(0,0);  // column, row 
    lcd.print(key);
    
    }
    
}