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

#define LEDM 26
#define LEDH 27

LiquidCrystal_I2C lcd (0X27, 16, 2);
const int rows = 4; 
const int columns = 4; 
char keys[rows][columns] = {

{'1','2','3','A'},

{'4','5','6','B'},

{'7','8','9','C'},

{'*','0','#','D'}

};
byte row_pins[rows] = {19,18,5,4};
byte column_pins[columns] = {2,15,13,12};
Keypad keypad = Keypad( makeKeymap(keys), row_pins, column_pins, rows, columns);   
char customKey;
int i=0;
int password = 1234;

void setup()

{
lcd.init();
lcd.backlight();
pinMode(LEDM, OUTPUT);
pinMode(LEDH, OUTPUT);

}
void loop() {
  lcd.setCursor(0,0);
  lcd.print("Password");

customKey = keypad.getKey();

    switch (customKey){
    case '0' ... '9':
    lcd.setCursor(0,1);
    i = i*10+(customKey-'0');
    lcd.print(i);
      break;
    case '#':
    if (i == password){
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Access Accepted");
      digitalWrite(LEDM, LOW);
      digitalWrite(LEDH, HIGH);
      delay(2500);
      i=0;
      lcd.clear();
      digitalWrite(LEDM, LOW);
      digitalWrite(LEDH, LOW);
    }
    else {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("Invalid Password");
      digitalWrite(LEDM, HIGH);
      digitalWrite(LEDH, LOW);
      delay(2500);
      i=0;
      lcd.clear();
      digitalWrite(LEDM, LOW);
      digitalWrite(LEDH, LOW);
    }
    }
}