#include <LiquidCrystal.h> // include the LCD library

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // initialize the LCD pins

int password = 679874; // set the password

void setup() {
  lcd.begin(16, 2); // set the LCD size
    lcd.print("Enter Password:"); // display prompt on LCD
    }

    void loop() {
      int input = 0; // initialize input variable
        while (input != password) { // loop until correct password is entered
            if (Serial.available() > 0) { // check for input from serial monitor
                  input = Serial.parseInt(); // read input as integer
                        lcd.setCursor(0, 1); // set cursor to second line of LCD
                              lcd.print("                "); // clear previous input
                                    lcd.setCursor(0, 1); // set cursor back to second line
                                          lcd.print(input); // display input on LCD
                                              }
                                                }
                                                  lcd.clear(); // clear LCD
                                                    lcd.print("Access Granted!"); // display success message
                                                      // add code here to unlock the security system
                                                      }

                                                      // Code sourced from Arduino website for LCD library: https://www.arduino.cc/en/Reference/LiquidCrystal