#include <Wire.h>
#include <LiquidCrystal_I2C.h>
//include keypad library//
#include <Keypad.h>
#include <Servo.h>

Servo myservo;

//define the constants for row and column sizes//
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'}
};

//Connect to Arduino
byte rowPins[ROWS] = {9,8,7,6};
byte colPins[COLS] = {5,4,3,2};

//Create keypad object
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins,colPins, ROWS, COLS);

//Create LCD Screen Object
LiquidCrystal_I2C lcd(0x27,20,4);

char password[5];
char initialpassword[5],newpassword[5];
int i = 0;
int pos = 0;
char S[5] = "1234";
int buzz = 0;

void setup() {
myservo.attach(14);
myservo.write(pos);
Serial.begin(9600);
pinMode(buzz, OUTPUT);

//Setup LCD with backlight and initialise
lcd.init();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print("Enter Password:");

}

void loop() {
char key =customKeypad.getKey();
if (key){
  if(key!='#' && key!='D'){
    //Serial.print('*)
    lcd.setCursor(i,1);
    lcd.print('*');
    password[i]=key;
    password[i+1] = NULL;
    i++;
  }
}

if(key=='#')
    {
      //Serial.println();
      if(strcmp(password,S)==0)
          {
            //Serial.println("ACCESS GRANTED");
            lcd.clear();
            lcd.print("ACCESS GRANTED");
            delay(3000);
            lcd.clear();
            lcd.print("WELCOME HOME!!");
            servo_t;
            clearerr;
          }
      else if(strcmp(password,S)!=0)
         {
           //Serial.println("ACCESS DENIED");
           lcd.clear();
           lcd.print("ACCESS DENIED");
           delay(2000);
           lcd.setCursor(0,0);
           lcd.print("Enter Password");
           clearerr;
         }
      i=0;             
    }

}


void servoOpen()
{
  for(;pos<=180;pos+=10)
  {
    myservo.write(pos);
    delay(40);
  }
}
void ServoClose()
{
  for(;pos>=0;pos-=10)
  {
    myservo.write(pos);
    delay(40);
  }
}

void clearData()
{
  password[0]=NULL;
}