Today, Raspberry Pi is actively used in a wide variety of projects, especially in automation systems – both home and more serious. To simplify interaction with such systems, especially if the device is somewhere in a corner or even in another city, it is convenient to give access to control via a browser. This allows you to use the interface from your computer and phone, being anywhere.
Let’s imagine that we already have a Python program that performs some important task: controls lighting, monitors the climate in the room or, for example, gives food to the cat. The task now is to make it possible to work with this program through a browser. There are several ways to do this – from the simplest, with almost no programming, to more advanced, with manual processing of HTTP requests.
Before moving on, it is worth making sure that the Raspberry Pi is connected to the network, has internet access and SSH is enabled. SSH is disabled by default, but it can be enabled by simply creating an empty file named ssh on the memory card – this will save time. To access the device, you need to know its IP address. Usually it can be found in the interface of your home router, where a list of all connected devices is displayed. Sometimes the IP address can change after rebooting the router, which is not very convenient, so it is better to set up a static IP on Raspberry Pi right away.
Once connected, you can start working with Python. Conveniently, all the code can be tested on a regular computer and then transferred to the Raspberry Pi. The only thing that may require adaptation is working with GPIOs if the program interacts with physical pins.
The easiest way to turn the Raspberry Pi into a server is to use the standard Python command, which allows you to start a file server with just one line. This method is suitable if you need to quickly share files or access a directory on the device through a browser.
A slightly more functional option is to embed the server directly into your Python program so that it runs automatically on startup. This will allow you to not depend on the command line and will give you more flexibility. The server will run in parallel with the main program logic, and the user will be able to connect through the browser at any time.
Another way is to use Python’s built-in tools to create a web server that can not only serve files, but also process requests. Such a server can be taught to display HTML pages, load images, and return data in JSON format. This is already a full-fledged variant suitable for building simple web control interfaces. For example, you can create a page that displays CPU temperature, load level, amount of free disk space or RAM usage. All these parameters can be obtained using Python libraries and given to the user on request.
It is convenient to transfer the obtained data in JSON format, as it is a universal and easily readable format that can be used not only in the browser, but also in other applications. All this makes Raspberry Pi a great platform for simple but useful home servers.
In conclusion, it’s worth reminding: if you plan to access your Raspberry Pi via the Internet, you need to think about security. Even if it seems that no one is interested in your device, it may well get into the field of view of automatic scanners. Therefore, it is important to set a complex password, disable unnecessary services and never store personal information on your device without protection. Otherwise, Python and Raspberry Pi provide a lot of opportunities, and even complex tasks can be realized in just a couple of evenings.