Microcomputers of Raspberry Pi attract more and more fans with every month. This is not only due to the latest models, characterized by exceptionally good parameters, including high computing power. Moreover, they offer great possibilities for use by both robotics and programming specialists, as well as people who need the hardware for normal daily use as an alternative to a classic tablet. The Raspberry Pi works well in many conditions, especially since it can be combined with various peripheral devices, which will create a hardware customized to our individual needs, as well as one that matches our project perfectly. Raspberry has a huge potential, but it remains underused to the maximum extent, which only reinforces the desire to discover its new possibilities not only by experienced programmers. The Raspberry Pi features a 40-pin GPIO connector that allows us to connect external devices. When you need an additional interface for your SoC processor to connect to the outside world, not necessarily favourable one, you can use the output expanders. You'll find them in our offer!