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

// Wi-Fi Credentials
const char* ssid = "ENTC2";      // Replace with your Wi-Fi SSID
const char* password = "123456789";  // Replace with your Wi-Fi Password

// ThingSpeak API Key and URL
const char* server = "http://api.thingspeak.com/update";
const char* apiKey = "6XXOWM4JU93IB65Q";  // Replace with your ThingSpeak API Key

// MQ-2 Sensor Pin
const int gasSensorPin = 34;  // Connect MQ-2 Analog output to GPIO 34

void setup() {
  Serial.begin(115200);
  
  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to Wi-Fi");
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("\nConnected to Wi-Fi");
}

void loop() {
  int gasValue = analogRead(gasSensorPin);  // Read gas sensor value

  Serial.print("Gas Level: ");
  Serial.println(gasValue);

  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = String(server) + "?api_key=" + apiKey + "&field1=" + String(gasValue);
    
    http.begin(url);
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
      Serial.print("ThingSpeak Response: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.println("Error in HTTP Request");
    }

    http.end();
  }

  delay(15000);  // Send data every 15 seconds
}