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

LiquidCrystal_I2C lcd(0x27, 20, 4);

char keys[4][4] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[4] = {13, 12, 11, 10};
byte colPins[4] = {9, 8, 7, 6};
Keypad kp = Keypad( makeKeymap(keys), rowPins, colPins, 4, 4);

Servo sv;

void setup() {
  lcd.begin(20, 4);
  sv.attach(5);
  sv.write(0);
  lcd.setCursor(0, 0);
  lcd.print("  Welcome to the");
  lcd.setCursor(0, 1);
  lcd.print("  Locker System!");
  delay(2000);
  lcd.clear();
  lcd.print("Press A to Open the");
  lcd.setCursor(0, 1);
  lcd.print("Locker!!!");
}

bool isEnteringPswd = false;
String enteringPswd = "";
String correctPswd = "12345";

void loop() {
  char key = kp.getKey();
  if (key != NO_KEY) {
    if (isEnteringPswd) {
      lcd.noBlink();
      if (key == 'A') {
        if (enteringPswd == correctPswd) {
          lcd.clear();
          lcd.print("Locker is Opening!!!");
          sv.write(150);
          delay(2000);
          lcd.clear();
          lcd.print("Locker Opened!");
        }else{
          
        }
      } else {
        enteringPswd = enteringPswd + key;
        lcd.print(key);
      }
    } else {
      if (key == 'A') {
        lcd.clear();
        lcd.print("Enter Password:");
        lcd.setCursor(0, 1);
        lcd.blink();
        isEnteringPswd = true;
      }
    }
  }
}