🌡️ WiFi Temperature Sensor (ESP32 + DHT11)

official page

A simple IoT temperature and humidity sensor based on ESP32-C3 and DHT11.
The device measures temperature and humidity, sends the data to a backend server, and from there it can be forwarded, for example, to a Telegram bot.

📌 Features

• Reads temperature and humidity from the DHT11 sensor
• Connects to Wi-Fi using WiFiManager (automatic configurator)
• Sends data to a server via HTTPS (with X-Api-Key and X-Device-Id headers)
• LED indicator while sending data
• Serial Monitor logging for debugging

🛠️ Hardware

• ESP32-C3 (ESP8266/ESP32 can also be used with minor pin adjustments)
• DHT11 sensor (can be replaced with DHT22 for better accuracy)
• LED indicator (LED_PIN)

⚙️ Setup

1. Install required libraries in Arduino IDE / PlatformIO:
   • DHT sensor library
   • WiFiManager
   • WiFiClientSecure
   • HTTPClient
2. Set your values in the code:

   #define API_KEY "your_api_key"
   #define DEVICE_ID "your_device_id"

3. Flash the firmware to the ESP32-C3.
4. On the first run, the device will create an access point ESP32_AP with password 12345678 — connect and configure your Wi-Fi credentials.

🚀 How it works

1. ESP32 connects to Wi-Fi.

2. Every 30 seconds, it reads data from the DHT11.

3. Data is sent to the server via a POST request in JSON format:

{
 "deviceId": "xxxx-xxxx-xxxx-xxxx",
 "temperature": 24.5,
 "humidity": 55.0
}

📡 Integration example

The backend receives the data and forwards it to a Telegram bot, so you can easily check the temperature and humidity in your room.

📷 Photo (example)

🔧 Author: udfowner