/*
author  : Rajeev TR
date    : 04/09/2024
https://github.com/HoNtErBoT
*/

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

LiquidCrystal_I2C lcd(0x27,16,2);
// Define the number of rows and columns on the keypad
const byte ROWS = 4;
const byte COLS = 4;
int Pass_len=5;
String myPass="369AB";
String userPass;
String lcdPass;
String hidePass;
char key;

// Define the keymap for your keypad
char keys[ROWS][COLS] = 
{
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {2, 3, 4, 5};   // Connect keypad ROW0, ROW1, ROW2, ROW3 to Arduino pins 2, 3, 4, 5
byte colPins[COLS] = {6, 7, 8, 9};   // Connect keypad COL0, COL1, COL2, COL3 to Arduino pins 6, 7, 8, 9
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);      // Create the Keypad object

void setup()
{
  
  lcd.begin(16,2);
  lcd.clear();
  lcd.print("Enter password");  
  lcd.setCursor(0, 0);
 
   
  
}


void loop()
{
  int i=0;
  key = keypad.getKey();       // Read the key
  if (key)
  {
     if(key!='#')
     userPass +=key;
     hidePass+=key;
     lcd.clear();
     lcd.print(hidePass); 
     lcd.setCursor(0, 1); 
     delay(300);
     lcd.clear();
     lcdPass +='*';
     hidePass=lcdPass;
     lcd.print(lcdPass); 
     lcd.setCursor(0, 1); 
  

  }
  if(key=='#')
  {
     if(userPass==myPass)
     {
       lcd.clear();
       lcd.print("Correct");  
       lcd.setCursor(0, 0);
       
     }
     else
         {
          lcd.clear();
          lcd.print("Incorrect");  
          lcd.setCursor(0, 1);
          userPass="";
          lcdPass="";
          hidePass="";
          delay(2500);
          lcd.clear();
          lcd.print("Enter password");  
          lcd.setCursor(0,1);
          
         }


  } 
}