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

const byte ROWS = 4;
const byte COLS = 4;

char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {11, 10, 9, 8};
byte colPins[COLS] = {7, 6, 5, 4};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

LiquidCrystal_I2C lcd(0x27, 16, 2);

String password = "2574";
String paswrt = "";
bool pas = true;
bool fch = false;
bool dch = false;


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

void loop() {
  char keypad = customKeypad.getKey();
  Serial.println(keypad);
  if(pas && !fch && !dch){
    lcd.setCursor(6, 0);
    lcd.print(paswrt);
    if(keypad >= 0 && keypad <= 9){
      paswrt += keypad;
    }
    switch(keypad){
      case '#':
        if(!paswrt){
          lcd.setCursor(3, 0);
          lcd.print("Incorrect!");
          paswrt = "";
          delay(1000);
        }
        else{
          lcd.setCursor(3, 0);
          lcd.print("Correct!");
          pas = false;
          fch = true;
          delay(1000);
        }
        break;
    }
  }
}