#define BLYNK_TEMPLATE_ID "TMPL58ms69n1I"
#define BLYNK_TEMPLATE_NAME "IOT ALARM SYSTEM"
#define BLYNK_AUTH_TOKEN "4JgM3oTFLm3AiIKazTjuEXAkk3xqqd-e" // Replace with your Blynk Auth Token

#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <NewPing.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

#define TRIGGER_PIN 5
#define ECHO_PIN 18
#define MAX_DISTANCE 200
#define RED_LED 15
#define GREEN_LED 16
#define BUZZER 4

char ssid[] = "Galaxy A02s9481";        // Replace with your WiFi SSID
char pass[] = "mhug3102";    // Replace with your WiFi Password

LiquidCrystal_I2C lcd(0x27, 16, 2);
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

const byte ROWS = 4; // four rows
const byte COLS = 4; // four columns
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {19, 23, 14, 27}; // connect to the row pinouts of the keypad
byte colPins[COLS] = {13, 32, 33, 25}; // connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String inputPassword;
String correctPassword = "3434";
bool alarmArmed = true;

void setup() {
  Serial.begin(115200);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  
  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Alarm System");
  
  Blynk.virtualWrite(V0, alarmArmed);
}

void loop() {
  Blynk.run();
  checkUltrasonicSensor();
  char key = keypad.getKey();
  
  if (key) {
    lcd.setCursor(0, 1);
    lcd.print("Enter Password: ");
    inputPassword += key;
    lcd.print(inputPassword);
    
    if (inputPassword.length() == 4) {
      if (inputPassword == correctPassword) {
        digitalWrite(GREEN_LED, HIGH);
        delay(2000);
        digitalWrite(GREEN_LED, LOW);
        alarmArmed = false;
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Disarmed");
      } else {
        digitalWrite(RED_LED, HIGH);
        tone(BUZZER, 1000);
        delay(2000);
        digitalWrite(RED_LED, LOW);
        noTone(BUZZER);
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Wrong Password");
        delay(1000);
      }
      inputPassword = "";
    }
  }
}

void checkUltrasonicSensor() {
  if (alarmArmed) {
    unsigned int distance = sonar.ping_cm();
    if (distance > 0 && distance < 100) {
      lcd.setCursor(0, 1);
      lcd.print("Intruder Alert! ");
    }
  }
}

BLYNK_WRITE(V0) {
  int pinValue = param.asInt();
  if (pinValue == 1) {
    alarmArmed = true;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Alarm Armed");
  } else {
    alarmArmed = false;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Alarm Disarmed");
  }
}