RelayDHT22.ino

#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <ESP8266HTTPClient.h>
#include <SimpleTimer.h>

#define heatFan D1  // RELAY ADD
#define TURN_ON HIGH   //  RELAY ADD
#define TURN_OFF LOW   // RELAY ADD

#include <Phant.h>
#include <DHT.h>
#define DHTTYPE DHT22
#define DHTPIN  D4
DHT dht(DHTPIN, DHTTYPE, D4);
float humidity, temp;  // Values read from sensor
unsigned long previousMillis = 0;
const long interval = 15000;          // interval at which to read sensor / Update values

byte hiHumidity = 30;  // relay ADD
byte lowHumidity = 35;  // relay ADD

// Auth Token App via Mail of printscreen
char auth[] = "##########";

void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, "#######", "##########");
  dht.begin();}

void gettemperature() {
  unsigned long currentMillis = millis();


  
  
  if (currentMillis - previousMillis >= interval) {
    // save the last time you read the sensor
    previousMillis = currentMillis;

    // Reading temperature for humidity takes about 250 milliseconds!
    // Sensor readings may also be up to 2 seconds 'old' (it's a very slow sensor)
    humidity = dht.readHumidity();          // Read humidity (percent)
    temp = dht.readTemperature(false);     // Read temperature as Fahrenheit

  
    
    Blynk.virtualWrite(V0, temp);
    Blynk.virtualWrite(V1, humidity);
    
    
    if (humidity >= hiHumidity)
      {
    digitalWrite(heatFan, TURN_ON);  // TURN ON heatFan (Relay1).
    Serial.print("\t");
    Serial.println(F("Exhausting the Humidity from A")); //  Text printed to serial monitor
    Serial.print("\t");
    Serial.println();
  }
    if (humidity <= hiHumidity)
      {
    digitalWrite(heatFan, TURN_OFF);  // TURN OFF heatFan (Relay1)
  }
    
  
    // Check if any reads failed and exit early (to try again).
    if (isnan(humidity) || isnan(temp)) {
      Serial.println("Failed to read from DHT sensor!");
      return;}
    
      
   
  }
}

bool isFirstConnect = true;
BLYNK_CONNECTED() {
  if (isFirstConnect)
  {
    Blynk.syncAll();
    isFirstConnect = false;
  }
}
 



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