#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>


  
Servo myservo;

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

byte pin_rows[4] = {12, 14, 27, 26};   
byte pin_column[4] = {25, 33, 13, 32}; 

Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, 4, 4 );
LiquidCrystal_I2C lcd(0x27, 16, 2); 

int cursorColumn = 0;

const String password = "1234"; 
String input_password;

void setup() {
  Serial.begin(9600);
  input_password.reserve(32); 
  myservo.attach(5);
  lcd.init(); 
  lcd.backlight();
  pinMode(2, INPUT);
  myservo.write(0);
}

void loop() {
  lcd.setCursor(0, 0); 
  lcd.print("Enter the OTP");
  char key = keypad.getKey();
  
  if (key) {
    
    
    lcd.setCursor(cursorColumn, 1);
    lcd.print(key);
    cursorColumn++;
    Serial.println(key);
    if (key == '*') {
      input_password = ""; 
      lcd.clear();
      cursorColumn=0;
    } else if (key == '#') {
      if (input_password == password) 
      {
        Serial.println("The password is correct => unlock");
        lcd.clear();
        lcd.setCursor(0, 1);
        
        lcd.print("Correct Password");
        delay(1000);
        lcd.clear();
        myservo.write(90);
        int i;
        i=0;
        while(i<=1000){
          delay(i);
          int state;
          state=digitalRead(2);
          if(state==HIGH)
          {
            int x=1;
            myservo.write(0);
            lcd.setCursor(0, 0);
            lcd.print("Locked");
            delay(1500);
            lcd.clear();
            lcd.print("Wait");
            i=1000;
          }
          i=i+100;
        
        }
        
          delay(500);
          lcd.setCursor(0, 1);
          lcd.print("4 sec left");
          delay(1000);
        
          lcd.setCursor(0, 1);
          lcd.print("3 sec left");
          delay(1000);
          
          lcd.setCursor(0, 1);
          lcd.print("2 sec left");
          delay(1000);
          
          lcd.setCursor(0, 1);
          lcd.print("1 sec left");
          delay(1000);
          lcd.clear();
          myservo.write(0);
        
      } else {
        Serial.println("The password is incorrect, try again");
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Incorrect");
        lcd.setCursor(0, 1);
        lcd.print("Password");
        delay(2000);
        lcd.clear();
      }
      cursorColumn=0;

      input_password = ""; 
    }
    else {
      input_password += key; 
    }
  }
}