/*
 * Created by ArduinoGetStarted.com
 *
 * This example code is in the public domain
 *
 * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-door-lock-system-using-password
 */

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

Servo myservo;
int pos = 0 ;
const int ROW_NUM    = 4; //four rows
const int COLUMN_NUM = 4; //four columns

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

byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows

const String password_1 = "1234ABC"; // change your password here
const String password_2 = "5642CD";  // change your password here
const String password_3 = "4545B";   // change your password here
String input_password;

void setup(){
  myservo.attach(11);

  ServoClose();
  Serial.begin(9600);
  input_password.reserve(32);    // maximum input characters is 33, change if needed
  pinMode(13, OUTPUT);   // initialize pin as an output.
  pinMode(12, OUTPUT);   // initialize pin as an output.
  lcd.init();                    // initialize the lcd
  lcd.backlight();
}
void ServoOpen()

{

  for (pos = 180; pos >= 0; pos -= 5) { // goes from 0 degrees to 180 degrees

    // in steps of 1 degree

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15ms for the servo to reach the position

  }

}

void ServoClose()

{

  for (pos = 0; pos <= 180; pos += 5) { // goes from 180 degrees to 0 degrees

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15ms for the servo to reach the position

  }

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

  if (key){
    Serial.println(key);

    if(key == '*') {
      input_password = ""; // reset the input password
      lcd.clear();
    } else if(key == '#') {
      lcd.clear();
      ServoClose() ;
      if(input_password == password_1 || input_password == password_2 || input_password == password_3) {
        Serial.println("password is correct");
        lcd.setCursor(0, 0);
        lcd.print("CORRECT!");
        lcd.setCursor(0, 1);
        lcd.print("DOOR UNLOCKED!");
        ServoOpen();

        digitalWrite(13, HIGH);
        delay(2000);
        digitalWrite(13, LOW);
      } else {
        Serial.println("password is incorrect, try again");
        lcd.setCursor(0, 0);
        lcd.print("INCORRECT!");
        lcd.setCursor(0, 1);
        lcd.print("ACCESS DENIED!");
        ServoClose() ;

        digitalWrite(12 , HIGH);
        delay(2000);
        digitalWrite(12, LOW);
      }

      input_password = ""; // reset the input password
    } else {
      if(input_password.length() == 0) {
        lcd.clear();
      }

      input_password += key; // append new character to input password string
      lcd.setCursor(input_password.length(), 0); // move cursor to new position
      lcd.print('*');                 // print * key as hiden character
    }
  }
}