/**************************************
 * Monitoring Suhu Kelembaban DHT22
 * Input : DHT22 (pin 8)
 * Out : LCD 16x2
 * koneksi DHT22 -- Arduino UNO
 *          Vcc  -- 5V
 *          Gnd  -- GND
 *          Data -- pin 8
 * koneksi LCD -- Arduino UNO
 *          RS -- 2
 *          E  -- 3
 *          D4 -- 4
 *          D5 -- 5
 *          D6 -- 6
 *          D7 -- 7
 *    www.ardutech.com
 **************************************/
#include <LiquidCrystal_I2C.h>   //library LCD
//koneksi LCD, lihat rangkaian
//LiquidCrystal lcd(2,3,4,5,6,7);
LiquidCrystal_I2C lcd(0x27,16,2);

#include <DHT.h> //library DHT22
#define DHTPIN 2 //pin data DHT22 konek ke pin 8 Arduino
#define DHTTYPE DHT22 //jenis sensor DHT22
DHT dht(DHTPIN, DHTTYPE); //setup pin dan jenis DHTT ke library
//deklarasi variabel untuk menampung pembacaan suhu & kelembaban
float humi, temp; 

void setup()
{
  lcd.begin(16, 2);  //type LCD 16x2
  lcd.backlight();
  lcd.setBacklight(HIGH);
  lcd.print("Monitoring DHT22"); //tampilan pertama  
  delay(2000); //tunda 2 detik 
  lcd.clear(); //hapus tampilan
  lcd.print("Temp=");//tampilkan di baris 1
  lcd.setCursor(0,1);//pindah ke baris 2
  lcd.print("Humi=");//tampilkan di baris 2
  dht.begin();
}
//============================
void loop()
{
  humi = dht.readHumidity(); //baca kelembaban
  temp = dht.readTemperature();//baca suhu
  if (isnan(humi) || isnan(temp)) {  //jika tidak berhasil  
    //Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  else{ //jika berhasil membaca sensor
    lcd.setCursor(6,0); //set kursor di baris 1, kolom 6
    lcd.print(temp);//tampilkan nilai suhu
    lcd.print(" C ");//Celcius
    lcd.setCursor(6,1);//set kursor di baris 2, kolom 6
    lcd.print(humi);//tampilkan nilai kelembaban
    lcd.print(" % "); //% RH  
  }
  delay(1000); //tunda 1 detik
}