#define BLYNK_TEMPLATE_ID "TMPL2k3czFiJB"
#define BLYNK_TEMPLATE_NAME "IoT HOME AUTOMATION"
#define BLYNK_AUTH_TOKEN "DiMU8-3iu5b1lgh7IQm956Dhsz5507PM"
// Comment this out to disable prints and save space
#define BLYNK_PRINT Serial
#define I2C_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_LINES 2

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include "DHT.h"
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);


char auth[] = BLYNK_AUTH_TOKEN;

//  WiFi credentials.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;
WiFiClient client;
 int sensorValue =0;
// Define pin assignments
//fire detection
#define ldrPin 34

#define relay1_pin 4
#define relay2_pin 19

int relay1_state = 0;
int relay2_state = 0;

//virtual pins 
#define button1_vpin V4
#define button2_vpin V2

// DHT22
#define DHTPIN 15    // Pin where the DHT11 is connected
#define DHTTYPE DHT22   // DHT 11 sensor type

DHT dht(15, DHT22);

// This function is called every time the device is connected to the Blynk.Cloud
BLYNK_CONNECTED() {
  Blynk.syncVirtual(button1_vpin);
  Blynk.syncVirtual(button2_vpin);
}
  BLYNK_WRITE(button1_vpin) {
  relay1_state = param.asInt();
  digitalWrite(relay1_pin, relay1_state);
}
BLYNK_WRITE(button2_vpin) {
  relay2_state = param.asInt();
  digitalWrite(relay2_pin, relay2_state);
}
// This function is called every time the Virtual Pin state change

void setup() {

  // Debug console
  //fire detection
  pinMode(ldrPin, INPUT);

  pinMode(relay1_pin, OUTPUT);
  pinMode(relay2_pin, OUTPUT);

  // During startup, all Relays should be turned OFF
  digitalWrite(relay1_pin, HIGH);
  digitalWrite(relay2_pin, HIGH);
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);

  dht.begin(); //dht starts
  //ledcSetup(0, 1000, 8); 
  lcd.init();
  lcd.backlight();
  lcd.begin(20, 4);
  lcd.setCursor(3, 0);
  lcd.print("Home Automation");
}

void loop() {
  // updateThingSpeak();
  Blynk.run();
  timer.run();
  // Read temperature and humidity values from DHT sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
int sensor_fire = analogRead(ldrPin);
sensor_fire =map(sensor_fire,0,1023,100,300);
sensor_fire =map(sensor_fire,100,300,0,100);

  // Display temperature and humidity on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("TEMP:");
  lcd.setCursor(8, 0);
  lcd.print(temperature);
  lcd.setCursor(0, 1);
  lcd.print("HUMID:");
  lcd.setCursor(8, 1);
  lcd.print(humidity);
  lcd.setCursor(0, 2);
  lcd.print("fire:");
  lcd.setCursor(8, 2);
  lcd.print(sensor_fire );
  Serial.print("sensor!");
  Serial.println(sensor_fire);
  Blynk.virtualWrite(V1, humidity);     // Send humidity value to Blynk App
  Blynk.virtualWrite(V0, temperature);  // Send temperature value to Blynk App
  Blynk.virtualWrite(V3, sensor_fire);  // Send temperature value to Blynk App
  
  //fire detection part:
  if((temperature >= 50)){    lcd.setCursor(0, 3);
  lcd.print("fire detected.");
  digitalWrite(relay1_pin, LOW);
  digitalWrite(relay2_pin,LOW);
    Serial.println(" fire detected. ");
  }
  else if ((sensor_fire >= 300) &&(temperature >= 40)) {
    lcd.setCursor(0, 3);
  lcd.print("fire detected.");
  digitalWrite(relay1_pin, LOW);
  digitalWrite(relay2_pin,LOW);
    Serial.println(" fire detected. ");
  
  } else {
      lcd.setCursor(0, 3);
       lcd.print(" no fire detected.");
    Serial.println(" no  fire detected. ");
  }
}