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

// WiFi Credentials
const char* ssid = "1111112";
const char* password = "12344321";

// Server URL
const char* serverURL = "http://localhost:3000/api/data";

// Sensor Pins
#define DHTPIN 4
#define MQ9PIN 34
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  
  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi!");
}

void loop() {
  // Read sensors
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int mq9Value = analogRead(MQ9PIN);
  
  // Convert MQ-9 reading to approximate CO2 (very basic conversion)
  float co2 = map(mq9Value, 0, 4095, 300, 5000);
  
  // Create JSON object
  StaticJsonDocument<200> doc;
  doc["temperature"] = temperature;
  doc["humidity"] = humidity;
  doc["co2"] = co2;
  doc["timestamp"] = millis();
  
  String jsonString;
  serializeJson(doc, jsonString);
  
  // Send to server
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin(serverURL);
    http.addHeader("Content-Type", "application/json");
    
    int httpCode = http.POST(jsonString);
    
    if (httpCode > 0) {
      Serial.println("Data sent successfully!");
    } else {
      Serial.println("Error sending data");
    }
    
    http.end();
  }
  
  delay(10000);  // Send data every 10 seconds
}