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


#define Password_Length 8 

int signalPin = 12;
char new_password[4];
char Data[Password_Length]; 
char Master[Password_Length] = "123A456"; 
byte data_count = 0, master_count = 0;
bool Pass_is_good;
char customKey;

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] = {9, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};

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

LiquidCrystal_I2C lcd(0x27, 16, 2);  

void setup(){
  lcd.init(); 
  lcd.backlight();
  pinMode(signalPin, OUTPUT);
  Myservo.attach(13);
}

void loop(){

  lcd.setCursor(3,0);
  lcd.print("**Smart Cabin**");

  lcd.setCursor(0,1);
  lcd.print("Enter Password:");

 lcd.setCursor(0,2);
  lcd.print("*******");
  
  customKey = customKeypad.getKey();
  if (customKey){
    Data[data_count] = customKey; 
    lcd.setCursor(data_count,1); 
    lcd.print(Data[data_count]); 
    data_count++; 
    }

  if(data_count == Password_Length-1){
    lcd.clear();

    if(!strcmp(Data, Master)){
        lcd.setCursor(0,1);
        lcd.print("*Access Granted*");

  lcd.setCursor(0,2);
  lcd.print("Have a Good Day");

  for(int i=0;i<=90;i=i+90)
  {
    Myservo.write(i);
    delay(3000);
  }
  Myservo.write(0);
  delay(15);
      }
    else{
    lcd.setCursor(0,0);
    lcd.print("*Access Denied*");
    lcd.setCursor(0,1);
    lcd.print("TRY AGAIN !!");
    delay(2000);    
      }
    lcd.clear();
    clearData();  
  }
  if(customKey=='#')
{
    change();
}
}

void change()

{

  int j=0;

  lcd.clear();

  lcd.print("Current Password");

  lcd.setCursor(0,1);

  while(j<7)

  {

    char key=customKeypad.getKey();

    if(key)

    {

      new_password[j++]=key;

      lcd.print(key);

       

    }

    key=0;

  }

  delay(500);
}
void clearData(){
  while(data_count !=0){
    Data[data_count--] = 0; 
  }
  return;
}