#define relay_pin 5
bool status_relay = 1;

#include "DHT.h"
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);


#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  Serial.begin(9600);
  pinMode(relay_pin, OUTPUT);
  Serial.println("DHT 22 test!");
  dht.begin();
  lcd.init();
  lcd.backlight();
}

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

  lcd.setCursor(0, 0);
  lcd.print("Temp : ");
  lcd.print(t);
  lcd.setCursor(0, 1);
  lcd.print("Hum : ");
  lcd.print(h);

  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C\t");
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println(" %");
  delay(1000);


  //jika temperatur lebihdari 24 derajat dan kurang dari 28 derajat
  if (t >= 24.0  && t <= 28.0)
  {
    digitalWrite(relay_pin, HIGH);
  }
  else
  {
    digitalWrite(relay_pin, LOW);
  }

}