#include "DHT.h"
#define DHTPIN 3
#define DHTTYPE DHT22


DHT dht(DHTPIN, DHTTYPE);

#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


const int RELAY_PIN = 9;

void setup() {
  // put your setup code here, to run once:
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
 
  Serial.println(F("DHTxx test!"));
  pinMode(RELAY_PIN, OUTPUT);

  dht.begin();
}

void loop() {
  // put your main code here, to run repeatedly:
  lcd.setCursor(14, 1);
    lcd.print(":)");
  delay(1000);
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
 
   //Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t) ) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
 
 // Compute heat index in Celsius (isFahreheit = false)
  //float hic = dht.computeHeatIndex(t, h, false);
  
  Serial.print(t);
  Serial.print(dht.readHumidity());

  lcd.setCursor(0, 0);
    lcd.print("T: ");
    lcd.print(t);
  lcd.setCursor(0, 1);
    lcd.print("H: ");
    lcd.print(h);
   lcd.setCursor(14, 1);  
    lcd.print("(:");
  // digitalWrite(RELAY_PIN, HIGH);
  delay(1000);
  // digitalWrite(RELAY_PIN, LOW);
    
      Serial.println(F("chequ"));
    if(t > 20 ){
      Serial.println(F("if"));
      digitalWrite(RELAY_PIN, HIGH);
    }
    if(t < 24){
      digitalWrite(RELAY_PIN, LOW);
      delay(500);
    }
}