blynk cpp

#define BLYNK_TEMPLATE_ID "TMPLTMAl97d4"
#define BLYNK_DEVICE_NAME "FireAlarm"
#define BLYNK_AUTH_TOKEN "NUIFzhzgfEwNfXkvMbAOvYYYXG2_NttS"

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h> 
#include <BlynkSimpleEsp8266.h>

#include <DHT.h>


char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "ssa";  // type your wifi name
char pass[] = "SLProject";  // type your wifi password

BlynkTimer timer;


#define DHTPIN 4 //Connect Out pin to D2 in NODE MCU
#define DHTTYPE DHT11  
DHT dht(DHTPIN, DHTTYPE);
int mq2 = A0;// smoke sensor is connected with the analog pin A0 
int data = 0;
void sendSensor()
{
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
  data = analogRead(mq2); 
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
   Blynk.virtualWrite(V1, t);
   Blynk.virtualWrite(V2, h);
   Blynk.virtualWrite(V3,data);
   Serial.print("Smoke: ");
   Serial.print(data);
   Serial.println();
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
   
    Serial.print("Temperature : ");
    Serial.print(t);
    Serial.println();
    Serial.print("Humidity : ");
    Serial.println(h);
    delay(1000);
    digitalWrite(D3,LOW);
    if(t>40||data>650)
    {
      digitalWrite(D3,HIGH);
      Blynk.logEvent("fire","FIRE!!!!");
      delay(5000);
    }
}
void setup()
{   
  
  Serial.begin(115200);
  pinMode(D3,OUTPUT);  

  Blynk.begin(auth, ssid, pass);//,"blynk-cloud.com",8080);
   while(WiFi.status() != WL_CONNECTED)
  {
    Serial.print("..");
    delay(200);
  }
  Serial.println();
  Serial.println("NodeMCU is Connected!");
  Serial.println(WiFi.localIP());
  dht.begin();
  timer.setInterval(100L, sendSensor);
 
  }

void loop()
{
  Blynk.run();
  timer.run();
 }