#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2); // GANTI 0x3F Ke 0x27 kalau LCD ga muncul
#include <DHT.h>

//inisialisasi pin DHT22
DHT dht(10, DHT22); //Pin, Jenis DHT

int powerPin = 3; // untuk pengganti VCC/5VOLT

// Mengatur pin untuk relay
#define RELAY_PIN 9

void setup() {
  //Inilisialisasi LCD
  lcd.init();
    // Menampilkan cahaya LCD
  lcd.backlight();

   // Inisialisasi relay
  pinMode(powerPin, OUTPUT); // default bernilai LOW
  digitalWrite(powerPin, LOW);
  Serial.begin(9600);
  dht.begin();

}

void loop() {
  digitalWrite(powerPin, HIGH);

  // Membaca data dari sensor DHT
  float kelembaban = dht.readHumidity();
  float suhu = dht.readTemperature();

  // Menampilkan data di Serial Monitor
  Serial.print("kelembaban: ");
  Serial.print(kelembaban);
  Serial.print(" % ");
  Serial.print("suhu: ");
  Serial.print(suhu);
  Serial.println(" C ");
  
    // Menampilkan data di  LCD
  lcd.setCursor(0,0);
  lcd.print("Kelembaban: ");
  lcd.print(kelembaban);
  lcd.print("%");
  
  lcd.setCursor(0,1);
  lcd.print("Suhu: ");
  lcd.print(suhu);
  lcd.print((char)223); // simbol derajat
  lcd.print("C");

// Mengontrol relay berdasarkan suhu dan kelembaban
if (kelembaban >= 30.0 && kelembaban <= 69.0 || suhu >= 30.0 && suhu <= 64.0){
  digitalWrite(RELAY_PIN, HIGH);  // relay ON
}else if(kelembaban <= 29.0 && suhu <= 29.0){
digitalWrite(RELAY_PIN, LOW);  // relay OFF
}
else  if(suhu >= 65.0 || kelembaban >= 70.0){
   digitalWrite(RELAY_PIN, HIGH);
  delay(200);
  digitalWrite(RELAY_PIN, LOW);
  delay(100);
}else if(suhu <= 29.0 || kelembaban <= 29.0){
  digitalWrite(RELAY_PIN, LOW);   // relay OFF
}else{
  digitalWrite(RELAY_PIN, LOW);  //relay OFF
}
 
  delay(1000); // tunggu selama dua detik
}