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

// Wi-Fi credentials
const char* ssid = "YDialog 4G";
const char* password = "nasik123";

// ThingSpeak API key
String apiKey = "4OL3UFS4R44BSWLD";

// DHT22 sensor settings
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// MQ135 sensor (simulated as analog sensor)
#define MQ135_PIN 34  // GPIO34 (Analog input)

void setup() {
  Serial.begin(115200);
  delay(1000);

  dht.begin();

  // Connect to Wi-Fi
  Serial.print("Connecting to Wi-Fi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWi-Fi Connected!");
}

void loop() {
  // Read sensor data
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int airQuality = analogRead(MQ135_PIN);  // 0 - 4095

  // Check sensor validity
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT22 sensor!");
    delay(5000);
    return;
  }

  // Print to Serial
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Air Quality: ");
  Serial.println(airQuality);

  // Send data to ThingSpeak
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = "https://api.thingspeak.com/update?api_key=" + apiKey +
                 "&field1=" + String(temperature) +
                 "&field2=" + String(humidity) +
                 "&field3=" + String(airQuality);

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

    if (httpResponseCode > 0) {
      Serial.println("Data sent to ThingSpeak successfully!");
    } else {
      Serial.print("Error sending data. Code: ");
      Serial.println(httpResponseCode);
    }

    http.end();
  } else {
    Serial.println("Wi-Fi Disconnected. Trying again...");
    WiFi.begin(ssid, password);
  }

  delay(15000);  // ThingSpeak accepts 1 request every 15 seconds
}