#include <Keypad.h>
#include <LiquidCrystal_I2C.h>

#define LCD_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2

 LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLUMNS, LCD_ROWS);


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 to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 9, 8, 7, 6 }; // Pins connected to R1, R2, R3, R4

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

String entrada="";
String secreto="3458";

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

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

  if (key != NO_KEY) {
    if (key=='#')
    {
    if(entrada==secreto)
      {
          lcd.setCursor(0,1);
          lcd.println("yuju");  
  
        }
      else
      {
        lcd.setCursor(0,1);
        lcd.println("ouch");
      }
     entrada="";
 
    }
  else{
    entrada=entrada+key;
    Serial.println(entrada);
    lcd.setCursor(0,0);
    lcd.println(entrada);
    }
  }
}