#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
LiquidCrystal_I2C lcd(0x27,16,2);
const int row=4;
const int col=4;
char arr[row][col]={
                    {'1','2','3','A'},
                    {'4','5','6','B'},
                    {'7','8','9','C'},
                    {'*','0','#','D'},
};
byte rpin[row]={2,3,4,5};
byte cpin[col]={6,7,8,9};
Keypad mykey=Keypad(makeKeymap(arr),rpin,cpin,row,col);
int g=12;
int r=11;
int bu=10;
String pass="1234";
int count=0;
String temp;
void setup() {
  // put your setup code here, to run once:
lcd.begin(16,2);
lcd.backlight();
lcd.print("Enter password");
delay(2000);
lcd.clear();
}
void loop() {
  // put your main code here, to run repeatedly:
char key=mykey.getKey();
if(key)
{
  if(key=='#')
  {
    if(temp==pass)
    {
      digitalWrite(g,HIGH);
      lcd.setCursor(1,1);
      lcd.print("corecct");
      delay(2000);
      digitalWrite(g,LOW);
      lcd.clear();
    }
    else if(temp!=pass)
    {
      count++;
      digitalWrite(r,HIGH);
      tone(bu,300);
      delay(2000);
      lcd.setCursor(1,1);
      lcd.print("incorecct");
      digitalWrite(r,LOW);
      noTone(bu);
      lcd.clear();
    }

  }
  if(key=='C')
  {
    lcd.clear();
    temp="";
  }
  else
  {
    temp+=key;
  }
}
if(count==3)
{
  digitalWrite(r, HIGH);
  tone(bu,300);
  lcd.print("incorecct");  
}
lcd.setCursor(0,0);
lcd.print(temp);
}