In this section, we will build an IoT weather station with an ESP32 board and a DHT22 module. We build a web server inside ESP32 and create a /weather HTTP request to serve temperature and humidity. The scenario for our project is as follows:

• The user can access a weather station via a browser application request to http://<esp32_server>/weather.
• The ESP32 program serves a /weather request.
• The ESP32 program reads the temperature and humidity from the DHT22 module.
• The ESP32 program sends a response by sending HTML with the temperature and humidity data.

You can see our simple architecture in the following figure:

We will test our weather system using a browser. We need an existing Wi-Fi network to enable the ESP32 board and serve weather information.

So, let's start.