#define FAN_PIN D2   // FAN RELAY
int inputpin = A0; // LM35 input pin

void setup() {
  Serial.begin(115200);
  pinMode(FAN_PIN, OUTPUT);
  digitalWrite(FAN_PIN, LOW);
}


void loop() {
  int analogValue = analogRead(inputpin);
  float millivolts = (analogValue / 1024.0) * 3300; //3300 is the voltage provided by NodeMCU
  float celsius = millivolts / 10;
  Serial.print("in DegreeC=   ");
  Serial.println(celsius);

  // Compare Threshold value from Blynk and DHT Temperature value.
  if (celsius > 30) {
    digitalWrite(FAN_PIN, HIGH);
  }
  else {
    digitalWrite(FAN_PIN, LOW);
  }
}

//@ApePanthiya ICT