#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <Keypad.h>
LiquidCrystal_I2C lcd(0X27,16,2);

int gled=13;
int rled=12;
int bgr=11;
const byte row=4;
const byte col=4;

byte rowp[row]={9,8,7,6};
byte colp[col]={5,4,3,2};

char hexa[row][col]={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

Keypad mykeypad=Keypad(makeKeymap(hexa),rowp,colp,row,col);

void setup() {
  // put your setup code here, to run once:
lcd.init();
lcd.backlight();
pinMode(gled, OUTPUT);
pinMode(gled, OUTPUT);
pinMode(bgr, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
static int pwd=1234;
static int c=0;
static int r=0;
static int p=0;
static int atm=0;
char key=mykeypad.getKey();
lcd.setCursor(0,0);
lcd.print("enter password");
if(key)
{
  if(key=='*')
  {
    if(p==pwd)
    {
      digitalWrite(gled, HIGH);
      tone(bgr,500);
      delay(1000);
      digitalWrite(gled,LOW);
      noTone(bgr);
      atm=0;
    }
    else
    {
      digitalWrite(rled, HIGH);
      tone(bgr,500);
      delay(1000);
      digitalWrite(rled,LOW);
      noTone(bgr);
      atm++;
      if(atm==3)
      {
        digitalWrite(rled, HIGH);
      tone(bgr,500);
      delay(5000);
      digitalWrite(rled,LOW);
      noTone(bgr);
      }
    }
    lcd.init();
    c=0;
    p=0;
  }
  else
  {
    lcd.setCursor(c,1);
    lcd.print("*");
    c++;
    p=p*10+key - '0';
  }
}

}