#include "DHT.h"

#define DHTPIN 2     // Digital pin connected to the DHT sensor

//#define DHTTYPE DHT11   // DHT 11
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

const int Relay_1 = 7;
const int Relay_2 = 8;

void setup() 
{
  pinMode(Relay_1, OUTPUT);
  pinMode(Relay_2, OUTPUT);
  digitalWrite(Relay_1, LOW);
  digitalWrite(Relay_2, LOW);

  Serial.begin(9600);
  Serial.println(" --> Start Program...");

  dht.begin();
}

void loop() 
{
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) 
  {
    Serial.println(F("Failed to read from DHT sensor!"));
  }

  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));

  if (t > 25 && h < 50)
  {
    digitalWrite(Relay_1, HIGH);
  }
  else
  {
    digitalWrite(Relay_1, LOW);
  }

  if (t <= 25 && h < 50)
  {
    digitalWrite(Relay_2, HIGH);
  }
  else
  {
    digitalWrite(Relay_2, LOW);
  }

  if (h >= 50)
  {
    digitalWrite(Relay_1, LOW);
    digitalWrite(Relay_2, LOW);
  }

  delay(1000);
}