esp_code.ino

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

// WiFi credentials
const char *ssid = "WIFI_NAME";
const char *password = "PWIFI_PW";

// Server url
const char *serverUrl = "http://1a68d31fc96915376990672871a32080.serveo.net/docs/thproject/index.php?p=";

// DHT sensor setup
#define DHTPIN 18     // Digital pin connected to the DHT sensor
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);

// Room identification - this varies for each ESP32, replace "room1", "room2", ...
const String roomId = "roomX";

// Time between measurements (in milliseconds)
const unsigned long interval = 60000; // 1 minute
unsigned long previousMillis = 0;

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

    // Initialize DHT sensor
    dht.begin();

    // Connect to WiFi
    WiFi.begin(ssid, password);
    Serial.println("Connecting to WiFi...");

    while (WiFi.status() != WL_CONNECTED)
    {
        delay(500);
        Serial.print(".");
    }

    Serial.println("");
    Serial.println("WiFi Connected");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
}

void loop()
{
    unsigned long currentMillis = millis();

    // Check if it's time to send data
    if (currentMillis - previousMillis >= interval)
    {
        previousMillis = currentMillis;

        // Read temperature and humidity
        float humidity = dht.readHumidity();
        float temperature = dht.readTemperature();

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

        Serial.print("Temperature: ");
        Serial.print(temperature);
        Serial.print(" °C, Humidity: ");
        Serial.print(humidity);
        Serial.println(" %");

        // Send data to server
        sendDataToServer(temperature, humidity, roomId);
    }
}

void sendDataToServer(float temperature, float humidity, String room)
{
    // Check WiFi connection status
    if (WiFi.status() == WL_CONNECTED)
    {
        HTTPClient http;

        // Construct the URL with parameters
        String url = String(serverUrl) + "data&room=" + room + "&temp=" + temperature + "&humidity=" + humidity;

        // Begin HTTP connection
        http.begin(url);

        // Send HTTP GET request
        int httpResponseCode = http.GET();

        if (httpResponseCode > 0)
        {
            String response = http.getString();
            Serial.println("HTTP Response code: " + String(httpResponseCode));
            Serial.println("Response: " + response);
        }
        else
        {
            Serial.print("HTTP Error: ");
            Serial.println(httpResponseCode);
        }

        // Free resources
        http.end();
    }
    else
    {
        Serial.println("WiFi Disconnected");
        // Attempt to reconnect
        WiFi.reconnect();
    }
}