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

/**********************declartion*************************/
#define ROWS_numbers 4 
#define COLS_number  4
#define servo 10
#define buzzer 11
#define led_red 12 
#define led_green 13 
/***********************keypad configration**************/
byte rowPins[ROWS_numbers ] = {9,8,7,6}; 
byte colPins[COLS_number] = {5,4,3,2}; 
char keys[ROWS_numbers][COLS_number] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'n','0','=','D'}
};

/*********************************************************/
/*********************varialbles****************************/
String temp="";
String correct_password="AB125";
/**********************************************************/
/*********************objects******************************/
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS_numbers,COLS_number  );
LiquidCrystal_I2C lcd(0x27,20,4);
Servo s;
/**********************************************************/
void setup() {
   pinMode(led_red,OUTPUT);
   pinMode(led_green,OUTPUT);
   pinMode(buzzer,OUTPUT);
   Serial.begin(9600);
  s.attach(servo);
  s.write(90);
  lcd.init();                      // initialize the lcd 
  lcd.backlight();
   lcd.print("Hello world!");
   lcd.setCursor(0,1);
   lcd.print("lock door system");
   delay(2000);
   lcd.clear();
   lcd.setCursor(0,0);
   lcd.print("Enter password: ");
   lcd.setCursor(0,1);
  
}

void loop() {
char key=keypad.getKey();
  //print key if not equal 0 hexa
  if(key && key!='D')
   { Serial.println(key);
     temp+=key;
     lcd.print('@');}
  else if(key){
    lcd.clear();
    if(temp == correct_password ){
       digitalWrite(led_green,HIGH);
       s.write(0);
       message("safe!" ,"correct password");
       digitalWrite(led_green,LOW);
       s.write(90);}
     else{
      digitalWrite(buzzer,HIGH);
      digitalWrite(led_red,HIGH);
       message("thief!","not correct password");
       digitalWrite(buzzer,LOW);
      digitalWrite(led_red,LOW);
       }
     }

}
void message(String m,String h ){
          temp="";
         lcd.setCursor(6,0);
          lcd.print(m);
          lcd.setCursor(0,1);
          lcd.print(h);
          delay(2000);
          lcd.clear();
          lcd.setCursor(0,0);
         lcd.print("Enter password: ");
         lcd.setCursor(0,1);
}