#include <Keypad.h>
#include <LiquidCrystal.h>
#include <Servo.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myServo;
const byte ROWS = 4; 
const byte COLS = 4; 
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; 
byte colPins[COLS] = {10, A0, A1, A2}; 
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String inputPassword;
const String correctPassword = "0000";
void setup() {
  lcd.begin(16, 2);
  myServo.attach(13);
  myServo.write(0); 
  lcd.print("Adj jelszót");
  lcd.setCursor(0, 1);
  lcd.print("jelszot:");
}
void loop() {
  char key = keypad.getKey();
  if (key) {
    if (key == '#') { 
      checkPassword();
    } else if (key == '*') { 
      inputPassword = "";
      lcd.clear();
      lcd.print("Adja meg a");
      lcd.setCursor(0, 1);
      lcd.print("jelszot:");
    } else {
      inputPassword += key; 
      lcd.setCursor(inputPassword.length() - 1, 1);
      lcd.print(key);
    }
  }
}
void checkPassword() {
  lcd.clear();
  if (inputPassword == correctPassword) {
    lcd.print("Tiéd a pénz");
    myServo.write(90); 
    delay(2000); 
    myServo.write(0); 
  } else {
    lcd.print("Jelszó nem oké!");
  }
  delay(2000); 
  inputPassword = ""; 
  lcd.clear();
  lcd.print("Adja meg a");
  lcd.setCursor(0, 1);
  lcd.print("jelszot:");
}