// include the library code:
#include <LiquidCrystal.h>
#include "DHT.h"

#define DHTPIN 8     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22 
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
const int fan = 13;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  pinMode(fan, OUTPUT);
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("temp");
  lcd.setCursor(0, 1);
  lcd.print("humi");
  dht.begin();
}

void loop() {
  delay(2000);

  // Read temperature in Celsius
  float temperature = dht.readTemperature();

  // Read humidity
  float humidity = dht.readHumidity();

  // Check if any reads failed
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  if(temperature >= 25){
    digitalWrite(fan, HIGH);
  }
  // Print temperature and humidity to the serial monitor
  lcd.setCursor(7, 0);
  lcd.print(temperature);
  lcd.print("C");

  lcd.setCursor(7, 1);
  lcd.print(humidity);
  lcd.print("%");
}