#include <DHT.h>

#define DHTPIN 2 // DHT11 sensor data pin
#define LED 5 // Relay control pin

#define DHTTYPE DHT22 // DHT11 sensor type
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  float temperature = dht.readTemperature(); // Read temperature from DHT11
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C");

  // Check temperature and control relay
  if (temperature < 40.0) {
   digitalWrite(LED, LOW); // Turn off relay
    Serial.println("EXHAUST FAN OFF");
  } else if (temperature > 40.0) {
    
     digitalWrite(LED, HIGH); // Turn on relay
    Serial.println("EXHAUST FAN ON");
    //delay(600000);
    delay(10000);
  }

  delay(1000);
}