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


#define DHTPIN 2   
#define DHTTYPE DHT22   
DHT dht(DHTPIN, DHTTYPE); 

int suhu;
int heater = 3;
int AC = 4;
String a;

void setup() {
  dht.begin();
  lcd.init();
  lcd.backlight();
  pinMode (AC, OUTPUT);
  pinMode (heater, OUTPUT);
}

void loop() {
  suhu = dht.readTemperature();
  lcd.setCursor (0, 0);
  lcd.print ("SUHU : "+String(suhu));
  lcd.setCursor (0, 1);
  lcd.print (a);
  if (suhu < 20){
    digitalWrite ( heater, HIGH);
    a = "HEATER:ON/AC: OFF";
  }
  if (suhu > 20 && suhu < 28){
    digitalWrite (AC, LOW);
    digitalWrite (heater, LOW);
    a = "HEATER&AC:OFF";
  }
  if (suhu > 28){
    digitalWrite (AC, HIGH);
    digitalWrite (heater, LOW);
    a = "HEATER:OFF/AC:ON";
  }
}