#include <LiquidCrystal_I2C.h>  // lcd library 
#include <Keypad.h> // keypad library 
#include <Wire.h>    // I2C communication library
LiquidCrystal_I2C Lcd(0x27, 16, 2);  
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] = {32, 33, 25, 26}; 
byte colPins[cols] = {27, 14, 12, 13}; 
Keypad keypad ( makeKeymap(keys), rowPins, colPins, rows, cols );
const String password = "1234";   // change your password here
String input_password;
int count = 0;
void setup() {
  input_password.reserve(8); 
  Lcd.init();
Lcd.backlight();
  Lcd.print("Enter YourPassword");
  Lcd.setCursor(0, 1);
  Serial.begin(9600);
}
void loop() {
  char key = keypad.getKey();
  if (key)
 {
    Serial.println(key);
    if (key == '*') 
    {
      if (count > 0)
       { 
         count--;
input_password.remove(count);
        Lcd.setCursor(count, 1);
        Lcd.print (" ");
} 
}
else if (key == '#') 
    {
      if (password == input_password) 
      {
        for (int i = 0; i < 3; i++)  {
          Lcd.setCursor(0, 0);
          Lcd.clear();
          Lcd.print("pass is correct");
          delay(2000);
          Lcd.setCursor(0, 0);
          Lcd.clear();
          delay(1000); }
        Lcd.print("Enter Your pass");
        Lcd.setCursor(0, 1);
      } 
      else  {
        for (int i = 0; i < 3; i++) {
          Lcd.setCursor(0, 0);
          Lcd.clear();
          Lcd.print("pass is Wrong");
          delay(2000);
          Lcd.setCursor(0, 0);
          Lcd.clear();
          delay(1000); }
        Lcd.print("Enter Your Password");
        Lcd.setCursor(0, 1); 
        }
      input_password = ""; 
      count = 0;
    }
 else 
    {
      input_password += key; 
      Lcd.setCursor(count, 1);
      Lcd.print(key);
      count++;
      Serial.print("count = ");
      Serial.println(count);
    }
    Serial.println(input_password);
  } // end of if(key)
} //end of void loop