#define BLYNK_TEMPLATE_ID "TMPL3zEBgQHXd"
#define BLYNK_TEMPLATE_NAME "OTP BASED DOOR LOCK SYSTEM"
#define BLYNK_AUTH_TOKEN "RejNl3aliyaPpABgkANzbHyw3zGRkQt-"

#define BLYNK_PRINT Serial

#include <BlynkSimpleEsp32.h>

#include <SoftwareSerial.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
 
char auth[] = "RejNl3aliyaPpABgkANzbHyw3zGRkQt-";
char ssid[] = "relic_07";  // type your wifi name
char password[] = "TRYNOT2open";  // type your wifi password

#include <Keypad.h>
#include<ESP32Servo.h>
Servo servo;

const byte ROWS = 4;
const byte COLS = 4;
char hexaKeys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};
byte rowPins[ROWS] = { 12,14,27,26};
byte colPins[COLS] = { 25,33,32,35};
Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define BUZZER 16
#define irsensor 17
int sw = 15;
int otp;
String otpstring = "";
int i = 0;

void setup()
{
  Serial.begin(115200);
   lcd.init();
  lcd.backlight();
    lcd.clear();
  lcd.print("CONNECTING TO...");
  lcd.setCursor(0,1);
  lcd.print(ssid);
  delay(1000);
  
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while(WiFi.status()!= WL_CONNECTED)
  {
    Serial.print('.');
    delay(500);
  }
   
  Blynk.config(BLYNK_AUTH_TOKEN);

  Blynk.config(auth);
  Serial.println("READY");
  
  lcd.clear();
  lcd.print(" WIFI CONNECTED ");
  Serial.print(" WIFI CONNECTED ");
  
  pinMode(sw, INPUT_PULLUP);
  pinMode(BUZZER,OUTPUT);
  digitalWrite(BUZZER,LOW);
  
  lcd.clear();
  lcd.print(" WIFI CONNECTED ");
  delay(2000);

  servo.attach(4);
  servo.write(90);
  delay(500);
 
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print(" OTP BASED DOOR ");
  lcd.setCursor(0, 1);
  lcd.print(" LOCK USING IOT ");
  
  if(digitalRead(irsensor)==LOW)
  {
    for(i=80;i>=0;i--)
  {
    servo.write(i);
    delay(15);
    lcd.clear();
    lcd.print("* THANK YOU *");

   }
   delay(10000);
  for(i=0;i<=80;i++)
  {
    servo.write(i);
    delay(15);

   }
  }
  if (digitalRead(sw) == LOW) {
    otp = random(2000, 9999);
    otpstring = String(otp);
    Serial.println(otpstring);
    while (digitalRead(sw) == LOW) {}
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("OTP SENT TO YOUR");
    lcd.setCursor(0, 1);
    lcd.print(" GAMIL AND IOT ");
    delay(3000);
    Serial.print("OTP is ");
    delay(100);
    Serial.println(otpstring);
    delay(100);
   Blynk.logEvent("sw",otpstring);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Enter OTP :");
    getotp();
    
  }
  Blynk.run();
}

void getotp() {

  String y = "";
  int a = y.length();
  while (a < 4) {
    char customKey = customKeypad.getKey();
    if (customKey)
    {
      lcd.setCursor(0, 1);
      y = y + customKey;
      lcd.print(y);
      a = y.length();
    }
  }
  Serial.print("Entered OTP is ");
  Serial.println(y);
  if (otpstring == y) {
    lcd.setCursor(0, 0);
    lcd.print("Access Granted");
    lcd.setCursor(0, 1);
    lcd.print("Door Opening");
    delay(2000);
    lcd.clear();
    lcd.print("* WELCOME *");
    delay(3000);
   for(i=90;i>=0;i--)
  {
    servo.write(i);
    delay(15);

   }
   delay(10000);
  for(i=0;i<=90;i++)
  {
    servo.write(i);
    delay(15);

   }
  } 
  else
  { 
    lcd.setCursor(0, 0);
    lcd.print("Access Failed");
    lcd.setCursor(0, 1);
    lcd.print("Try Again !!!");   
  digitalWrite(BUZZER,HIGH);
    delay(2000);
    digitalWrite(BUZZER,LOW);
    delay(3000);
   
  }
}