#include <DHT.h> // library sensor
#include <WiFi.h> // library wifi
#include <LiquidCrystal_I2C.h> // library LCD I2C
#include <HTTPClient.h> // library httpclient
#include <Wire.h> // library wire

#define TEMPERATURE_THRESHOLD_ON 15 // Threshold suhu untuk menyalakan relay ke-1
#define TEMPERATURE_THRESHOLD_OFF 35 // Threshold suhu untuk menyalakan relay ke-1
#define DHT_PIN 27 // Pin untuk sensor dht22
#define RELAY_PIN 18 // Pin untuk relay 1 heater

LiquidCrystal_I2C lcd(0x27, 16, 2); // Alamat I2C dan ukuran LCD
DHT dht(DHT_PIN, DHT22);

const char* server = "api.thingspeak.com";
const char* apiKey = "RPOHGSZW9YQDWJ2M";
const char* ssid = "Wokwi-GUEST";
const char* password = "";



void setup() {
  // Setup awal sensor
  dht.begin();

  // Setup pin relay sebagai output ppada serial monitor
  pinMode(RELAY_PIN, OUTPUT);
  Serial.begin(115200);

  // setup Connect ke WiFi
  connectToWiFi();

  // Setup tampilan lcd
  lcd.init();
  lcd.setCursor(0, 0);
  lcd.print("suhu: ");
  lcd.setCursor(0, 1);
  lcd.print("kelmbpn: ");
  lcd.setCursor(0, 2);
  
}

void connectToWiFi() { //fungsi connect ke wifi
  Serial.println("menghubungkan ke WiFi...");

  WiFi.begin(ssid, password);
  int retryCount = 0;
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
    retryCount++;
    if (retryCount > 10) {
      Serial.println();
      Serial.println("gagal terhubung ke WiFi");
      return;
    }
  }

  Serial.println();
  Serial.println("terhubung ke WiFi...!");
}

void loop() {
  // membaca suhu dan kelembapan
  float temp = dht.readTemperature();
  float humidity = dht.readHumidity();


 // menampilkan suhu dan kelembapan di LCD I2C
  lcd.setCursor(6, 0);
  lcd.print(temp);
  lcd.print("C ");
  lcd.setCursor(10, 1);
  lcd.print(humidity);
  lcd.print("% ");
  
  // menampilkan suhu dan kelembapan di Serial Monitor
  Serial.print("suhu: ");
  Serial.print(temp);
  Serial.print(" °C ");
  Serial.print("kelembapan udara: ");
  Serial.print(humidity);
  Serial.println(" % ");

  // kontrol relay berdasarkan suhu
  if (temp <= TEMPERATURE_THRESHOLD_ON) {
    digitalWrite(RELAY_PIN, HIGH);  // relay akan hidup
  } else if (temp >= TEMPERATURE_THRESHOLD_OFF){
    digitalWrite(RELAY_PIN, LOW);   // relay akan mati
  }

  // transfer data ke Thingspeak
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = "http://";
    url += server;
    url += "/update?api_key=";
    url += apiKey;
    url += "&field1=";
    url += String(temp);
    url += "&field2=";
    url += String(humidity);
    http.begin(url);

    int httpCode = http.GET();
    if (httpCode > 0) {
      Serial.println("Data terkirim");
    } else {
      Serial.println("gagal mengirim data");
    }

    http.end();
  } else {
    Serial.println("WiFi tidak tersambung, menghubungkan kembali...");
    connectToWiFi();
  }

  delay(3000);
}