#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
const byte numRows=4;
const byte numCols=4;
int LCD_ADDRESS=0x27;
int LCD_Cols=16;
int LCD_Rows=2;
LiquidCrystal_I2C lcd(LCD_ADDRESS,LCD_Cols,LCD_Rows);

char keymap[numRows][numCols]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'},
};
byte rowPin[numRows]={27,21,12,4};
byte ColPin[numCols]={23,25,26,14};

Keypad keypad=Keypad(makeKeymap(keymap), rowPin, ColPin, numRows, numCols);

void setup(){
  Serial.begin(9600);

  lcd.init ();
  lcd.backlight();

  delay(1000);

}
void loop(){
  char key = keypad.getKey();
  if (key!=NO_KEY) {
     
    lcd.print(key);
  }
  }