#include <Keypad.h>
#include<LiquidCrystal.h>
#include<EEPROM.h>
#define buzzer 14
 /*The circuit:
 * LCD RS pin to digital pin 13
 * LCD Enable pin to digital pin 12
 * LCD D4 pin to digital pin 11
 * LCD D5 pin to digital pin 10
 * LCD D6 pin to digital pin 9
 * LCD D7 pin to digital pin 8
 * LCD R/W pin to ground
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 14)
 */
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
char password[4] = {1,2,3,4};
char pass[4]={4,3,2,1}, pass1[4];
int i = 0;
int lcd_pin = 15;

char customKey = 0;
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char hexaKeys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {7, 6, 5, 4}; 
//connect to the row pinouts of the keypad
byte colPins[COLS] = {3, 2, 1, 0}; 
//connect to the column pinouts of the keypad

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

void setup()
{
  lcd.begin(16, 2);
  pinMode(lcd_pin, OUTPUT);
  pinMode(buzzer, OUTPUT);
 // pinMode(m11, OUTPUT);
 // pinMode(m12, OUTPUT);
  lcd.print("  Electronic ");
  lcd.setCursor(0, 1);
  lcd.print("  Keypad Lock ");
  delay(2000);
  lcd.clear();
  lcd.print("Enter Ur Passkey:");
  lcd.setCursor(0, 1);
  for (int j = 0; j < 4; j++)
    EEPROM.write(j, j + 49);
  for (int j = 0; j < 4; j++)
    pass[j] = EEPROM.read(j);
}

void loop()
{
  customKey = customKeypad.getKey();
  if (customKey == '#')
    change();
  if (customKey)
  {
    password[i++] = customKey;
    lcd.print(customKey);
    beep();
  }
  if (i == 4)
  {
    delay(200);
    for (int j = 0; j < 4; j++)
      pass[j] = EEPROM.read(j);
    if (!(strncmp(password, pass, 4)))
    {
      digitalWrite(lcd_pin, HIGH);
      beep();
      lcd.clear();
      lcd.print("Passkey Accepted");
      delay(2000);
      lcd.setCursor(0, 1);
      lcd.print("#.Change Passkey");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Passkey:");
      lcd.setCursor(0, 1);
      i = 0;
      digitalWrite(lcd_pin, LOW);
    } else
    {
      digitalWrite(buzzer, HIGH);
      lcd.clear();
      lcd.print("Access Denied...");
      lcd.setCursor(0, 1);
      lcd.print("#.Change Passkey");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Passkey:");
      lcd.setCursor(0, 1);
      i = 0;
      digitalWrite(buzzer, LOW);
    }
  }
}

void change()
{
  int j = 0;
  lcd.clear();
  lcd.print("UR Current Passk");
  lcd.setCursor(0, 1);
  while (j < 4)
  {
    char key = customKeypad.getKey();
    if (key)
    {
      pass1[j++] = key;
      lcd.print(key);
      beep();
    }
    key = 0;
  }
  delay(500);

  if ((strncmp(pass1, pass, 4)))
  {
    lcd.clear();
    lcd.print("Wrong Passkey...");
    lcd.setCursor(0, 1);
    lcd.print("Better Luck Again");
    delay(1000);
  }
  else
  {
    j = 0;

    lcd.clear();
    lcd.print("Enter New Passk:");
    lcd.setCursor(0, 1);
    while (j < 4)
    {
      char key = customKeypad.getKey();
      if (key)
      {
        pass[j] = key;
        lcd.print(key);
        EEPROM.write(j, key);
        j++;
        beep();
      }
    }
    lcd.print("  Done......");
    delay(1000);
  }
  lcd.clear();
  lcd.print("Enter Ur Passk:");
  lcd.setCursor(0, 1);
  customKey = 0;
}
void beep()
{
  digitalWrite(buzzer, HIGH);
  delay(20);
  digitalWrite(buzzer, LOW);
}