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

Servo myservo;
LiquidCrystal lcd(A0, A1, A2, A3, A4, A5);

#define Password_size 6   //Give enough room for six chars + NULL char
    //NULL char is used here to signify the end of the 'password' string
int position = 0;                //variable to store the servo position
char Data[Password_size]; //6 is the number of chars it can hold + the null char = 7

char Pass[Password_size] = "123A#";

byte Data_count = 0;
byte Pass_count = 0;
char customKey;

const byte ROWS = 4;
const byte COLS = 4;

char keys[ROWS][COLS] = {

  {'1', '2', '3','A'},
  {'4', '5', '6','B'},
  {'7', '8', '9','C'},
  {'*', '0', '#','D'}

};

byte rowPins[ROWS] = {1, 2, 3, 4}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 6, 7, 8}; //connect to the column pinouts of the keypad

Keypad customKeypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS); //initialize an instance of class NewKeypad

int lamp=12;
void setup()

{
  pinMode(lamp, OUTPUT);
  myservo.attach(9);
  ServoClose();
  lcd.begin(16, 2);
  lcd.print("Automatic Door");
  lcd.setCursor(0, 1);
  delay(3000);
  lcd.clear();
}

void loop()
  {
    customKey = customKeypad.getKey();
    if (customKey =='#')
    {
      lcd.clear();
      ServoClose();
      lcd.print("Door is close");
      delay(3000);
    }
   else Check_access();
  }

void clearData()

{

  while (Data_count != 0)

  { 

    Data[Data_count--] = 0; //clear array for new data

  }

  return;

}

void ServoOpen()

{
  // goes from 0 degrees to 180 degrees in steps of 5 degree
  for (position = 180; position >= 0; position -= 1) 
  {
    
    myservo.write(position); // tell servo to go to position in variable 'position'
    delay(15);          // waits 15ms for the servo to reach the position
  }
}

void ServoClose()

{
  // goes from 180 degrees to 0 degrees
  for (position = 0; position <= 180; position += 1) 
  { 
    myservo.write(position); // tell servo to go to position in variable 'position'
    delay(15);          // waits 15ms for the servo to reach the position
  }
}

void Check_access()

{

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

  customKey = customKeypad.getKey();

  if (customKey) //makes sure a key is actually pressed, equal to (customKey != NO_KEY)

  {

    Data[Data_count] = customKey; //store char into data array
    lcd.setCursor(Data_count, 1); //move cursor to show each new char
    lcd.print(Data[Data_count]);  //print char at said cursor
    Data_count++; //increment data array by 1 to store new char, also keep track of the number of chars entered

  }

  if (Data_count == Password_size-1) //if the array index is equal to the number of expected chars, compare data to Pass

  {

    if (!strcmp(Data, Pass)) //equal to (strcmp(Data, Pass) == 0)

    {

      lcd.clear();
      lcd.print("Access granted");
      ServoOpen();
      digitalWrite(lamp, HIGH);
      delay(10000);
      ServoClose();
      digitalWrite(lamp, LOW);

    }
      else{
      lcd.clear();
      lcd.print("Wrong Password");
      delay(1000);
      }
      clearData();
     }
  }