#include <LiquidCrystal.h>

#include "DHT.h"

#define DHTPIN 2
#define DHTTYPE DHT22

int rs = 7;
int en = 8;
int d4 = 9;
int d5 = 10;
int d6 = 11;
int d7 = 12;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int fanPin = 13;

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println(F("DHTxx test!"));
  dht.begin();
  lcd.begin(16, 2);
  pinMode(fanPin, OUTPUT);
}

void loop() {
  delay(2000);

  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!"));
    return;
  }
  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);

  lcd.setCursor(0, 0);
  lcd.print("Temp C= ");
  lcd.print(t);
  lcd.setCursor(0, 1);
  lcd.print("Humidity= ");
  lcd.print(h);
  lcd.print(" %");
  delay(1000);


  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 >= 30) {
    digitalWrite(fanPin, HIGH);
  }
  if (t <= 30) {
    digitalWrite(fanPin, LOW);
  }
  delay(1000);
}