#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>
#include <Adafruit_SSD1306.h>
#include <Wire.h>

// ThingSpeak settings
const char* ssid = "YourSSID";  // Ganti dengan SSID WiFi kamu
const char* password = "YourPassword";  // Ganti dengan password WiFi kamu
String apiKey = "YOUR_API_KEY";  // Ganti dengan API Key dari ThingSpeak
const char* server = "http://api.thingspeak.com";

// DHT22 Settings
#define DHTPIN 15  // Pin untuk DHT22
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// LDR Settings
int ldrPin = 34;  // Pin untuk LDR

// OLED Settings
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET    -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);

    // Setup WiFi
      WiFi.begin(ssid, password);
        while (WiFi.status() != WL_CONNECTED) {
            delay(1000);
                Serial.println("Connecting to WiFi...");
                  }
                    Serial.println("Connected to WiFi!");

                      // Setup DHT22
                        dht.begin();

                          // Setup OLED
                            Wire.begin(21, 26);  // SDA ke GPIO 21, SCL ke GPIO 26
                              if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
                                  Serial.println(F("SSD1306 allocation failed"));
                                      for (;;);
                                        }
                                          display.clearDisplay();
                                            display.setTextSize(1);
                                              display.setTextColor(WHITE);
                                                display.setCursor(0, 0);
                                                  display.print("System started");
                                                    display.display();
                                                    }

                                                    void loop() {
                                                      // Baca data dari DHT22
                                                        float temperature = dht.readTemperature();
                                                          float humidity = dht.readHumidity();

                                                            // Baca data dari LDR
                                                              int ldrValue = analogRead(ldrPin);

                                                                // Cek apakah pembacaan sensor valid
                                                                  if (isnan(temperature) || isnan(humidity)) {
                                                                      Serial.println("Failed to read from DHT sensor!");
                                                                          return;
                                                                            }

                                                                              // Tampilkan data di OLED
                                                                                display.clearDisplay();
                                                                                  display.setCursor(0, 0);
                                                                                    display.print("Temp: ");
                                                                                      display.print(temperature);
                                                                                        display.println(" C");
                                                                                          display.print("Humidity: ");
                                                                                            display.print(humidity);
                                                                                              display.println(" %");
                                                                                                display.print("Light: ");
                                                                                                  display.print(ldrValue);
                                                                                                    display.display();

                                                                                                      // Kirim data ke ThingSpeak
                                                                                                        if (WiFi.status() == WL_CONNECTED) {
                                                                                                            HTTPClient http;
                                                                                                                String url = String(server) + "/update?api_key=" + apiKey;
                                                                                                                    url += "&field1=" + String(temperature);  // Field 1 untuk suhu
                                                                                                                        url += "&field2=" + String(humidity);     // Field 2 untuk kelembaban
                                                                                                                            url += "&field3=" + String(ldrValue);     // Field 3 untuk intensitas cahaya

                                                                                                                                http.begin(url);
                                                                                                                                    int httpCode = http.GET();

                                                                                                                                        if (httpCode > 0) {
                                                                                                                                              String payload = http.getString();
                                                                                                                                                    Serial.println("Data sent to ThingSpeak: " + payload);
                                                                                                                                                        } else {
                                                                                                                                                              Serial.println("Error sending data to ThingSpeak");
                                                                                                                                                                  }
                                                                                                                                                                      http.end();
                                                                                                                                                                        }

                                                                                                                                                                          delay(20000);  // Kirim data setiap 20 detik
                                                                                                                                                                          }