// https://circuitdigest.com/microcontroller-projects/digital-code-lock-using-arduino


// By Default 1234   //8874

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

#include<EEPROM.h>

#define buzzer 8   // with pressing any button
#define led 9      // when Password mathches becomes HIGH for short time// yaha LED ki jagah NPN ya direct connection hoga
#define m11 10     // Bilcolor LED Green Part
#define m12 11     // Bilcolor LED Red Part

void createCustomCharacters();
void printFrame();

//defining House Icon
byte housechar1[8]={B00000, B00001, B00011, B00011, //Row 0, Col 0
                  B00111, B01111, B01111, B11111,};
byte housechar2[8]={B11111, B11111, B11100, B11100, //Row 1, Col 0
                  B11100, B11100, B11100, B11100,};
byte housechar3[8]={B00000, B10010, B11010, B11010, //ROW 0, Col 1
                  B11110, B11110, B11110, B11111,};
byte housechar4[8]={B11111, B11111, B11111, B10001, //Row 1, Col 1
                    B10001, B10001, B11111, B11111,};

LiquidCrystal_I2C lcd(0x27, 20, 4);


char password[4];

char pass[4],pass1[4];

int i=0;

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] = {3, 2, 1, 0}; //connect to the row pinouts of the keypad

byte colPins[COLS] = {4, 5, 6, 7}; //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()

{


  pinMode(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(m11, OUTPUT);
  pinMode(m12, OUTPUT);
  digitalWrite(led, LOW);
  digitalWrite(buzzer, LOW);
  digitalWrite(m11, LOW);
  digitalWrite(m11, LOW);
 
  lcd.init();
 
  lcd.backlight();

  lcd.clear();
  delay(1000);
  lcd.createChar(1,housechar1);
  lcd.createChar(2,housechar2);
  lcd.createChar(3,housechar3);
  lcd.createChar(4,housechar4);
  lcd.setCursor(0,0);
  lcd.write(1);
  lcd.setCursor(0,1);
  lcd.write(2);
  lcd.setCursor(1,0);
  lcd.write(3);
  lcd.setCursor(1,1);
  lcd.write(4);
  lcd.setCursor(3,0);
  lcd.print("Electro ");
  lcd.setCursor(3,1);
  lcd.print("Devices AJMER ");
  delay(10000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Now.............. ");
  delay(3000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Enter Ur Passkey:");

  

  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=='#')                            // Password Change Facility

  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(led, HIGH);

      beep();

      lcd.clear();

      lcd.print("Passkey Accepted");

//*********************************************
      digitalWrite(m11, HIGH);
      delay(5000);
      digitalWrite(m11, LOW);
      digitalWrite(led, HIGH);   // Jab tak Arduino Auto Power Off chale Yani 3 Min
     // delay(60000);
     // digitalWrite(led, LOW);     // Kaam hone k baad ye jab LOW hoga to Automatic Lock Lag Jayega



//***************************************************
      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(led, LOW);

    }

    

    else

    {

      digitalWrite(buzzer, HIGH);

      lcd.clear();

      lcd.print("Access Denied...");
//************************************************************************
      digitalWrite(m12, HIGH);
      delay(5000);
      digitalWrite(m12, LOW);
      digitalWrite(led, LOW);   // Jab tak Arduino Auto Power Off chale Yani 3 Min

//************************************************************************


      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);

}