#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

#include <Keypad.h>

const uint8_t BARIS=4;
const uint8_t KOLOM=4;
char keys[BARIS][KOLOM]={
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'},
};
uint8_t colPins[KOLOM]={5,4,2,15};
uint8_t rowPins[BARIS]={14,12,19,18};
Keypad keypad=Keypad(makeKeymap(keys),rowPins,colPins,BARIS,KOLOM);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2,0);

Serial.begin(9600);
}
void loop() {
char key=keypad.getKey();
if (key!=NO_KEY){
Serial.println(key);

lcd.print(key);
}
}