#include <LiquidCrystal_I2C.h>
#include <DHT.h>

LiquidCrystal_I2C lcd(0x27,16,2);

#define fan 4 // pin relay
#define DHTPIN 2 // pin dht
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

//SENSOR ULTRASONIK 
const int trigPin = 7;
const int echoPin = 6;

void setup() {
  //INISIALIASI LCD
  lcd.init();
  lcd.backlight();
  
  //PIN RELAY(KIPAS)
  pinMode(fan, OUTPUT);

  //PIN SENSOR
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  //INISIALISASI SENSOR DHT
  dht.begin();

  Serial.begin(9600);

}

void loop() {
  //VARIABEL SUHU DALAM FLOAT
  float t = dht.readTemperature();
  float h = dht.readHumidity();

  Serial.print("Suhu : ");
  Serial.print(t);
  Serial.print("°C Kelembaban : ");
  Serial.print(h);
  Serial.print("%");

  // Mengirim sinyal ultrasonik
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Membaca waktu pantulan gelombang ultrasonik
  long duration = pulseIn(echoPin, HIGH);
  long distance = duration/58.2;

  //MENGKOSONGKAN LCD
  lcd.clear();

  //MENULIS BARIS PERTAMA
  lcd.setCursor(0,0);
  lcd.print("INFORMASI");

  //MENULIS SUHU UDARA
  lcd.setCursor(0,1);
  lcd.print("T : ");
  lcd.print((int)t);
  lcd.print("C");

  //MENULIS KELEMBABAN UDARA
  lcd.setCursor(9,1);
  lcd.print("H : "); 
  lcd.print((int)h);
  lcd.print("%");

  //MENYALAKAN DAN MEMATIKAN KIPAS
  if (distance > 100 && t > 30.00) {
    digitalWrite(fan, HIGH);
    Serial.println(" Objek Terdeteksi, Kipas Menyala");
  } else { 
    digitalWrite(fan, LOW);
    if (distance <= 100) {
      Serial.println(" Objek Tidak Terdeteksi, Kipas Mati");
    } else {
      Serial.println(" Objek Terdeteksi , Kipas Mati");
    }
  }
  
  delay(1000); 
}