#include "DHT.h"
#include <Blynk.h>

#define DHTPIN D8
#define DHTTYPE DHT11
#define LED_PIN D9

DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

void setup() {
  Serial.begin(9600);
  dht.begin();
  Blynk.begin(auth, ssid, pass);

  pinMode(LED_PIN, OUTPUT);
  Blynk.virtualWrite("LED_PIN", LOW);
  timer.setInterval(2000, readTemp);
}

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

void readTemp() {
  float t = dht.readTemperature();

  if (t >= 30) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
}

void virtualWrite(String pin, int value) {
  if (pin == "LED_PIN") {
    digitalWrite(LED_PIN, value);
  }
}