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

// Replace these with your network credentials
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";

// ThingSpeak settings
const char* server = "api.thingspeak.com";
const String channelID = "3088505";
const String writeAPIKey = "CJW344I3IBISDG68";

// Pins
#define LDR_PIN 34         // Analog pin for LDR
#define DHTPIN 4           // Digital pin for DHT sensor
#define DHTTYPE DHT22      // DHT22 sensor, change to DHT11 if needed

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  delay(100);

  // Initialize DHT sensor
  dht.begin();

  // Connect to WiFi
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  // Read sensors
  int ldrValue = analogRead(LDR_PIN);
  float temperature = dht.readTemperature(); // Celsius

  if (isnan(temperature)) {
    Serial.println("Failed to read temperature from DHT sensor!");
    temperature = 0.0;  // Handle error by sending zero or last known value
  }

  Serial.print("LDR Value: ");
  Serial.print(ldrValue);
  Serial.print(" | Temperature: ");
  Serial.println(temperature);

  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = String("http://") + server + "/update?api_key=" + writeAPIKey
                 + "&field1=" + String(ldrValue)
                 + "&field2=" + String(temperature);

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

    if (httpCode > 0) {
      String payload = http.getString();
      Serial.print("Response code: ");
      Serial.println(httpCode);
      Serial.print("Response: ");
      Serial.println(payload);
    } else {
      Serial.print("Error on sending request: ");
      Serial.println(httpCode);
    }
    http.end();
  } else {
    Serial.println("WiFi Disconnected");
  }

  // ThingSpeak allows updates every 15 seconds
  delay(15000);
}