Low acquisition costs, a large community and easily accessible interfaces are the success factors of Arduino and Raspberry Pi. Whether sensors, displays or other hardware - precise knowledge of interfaces such as SPI and I2C is essential for successful projects. Whether Arduino or Raspberry Pi - in the book "Bus systems in practice" you will learn how these interfaces work in detail and use them in practical projects for both important platforms. The complete source code is available to download for a quick start. The most important interfaces for your own Maker projects are described with circuit diagrams, block diagrams and protocol descriptions. To enable you to apply the knowledge directly to Arduino and Raspberry Pi, the author presents numerous practical projects with circuit diagrams and source code: The connection of sensors via I2C, the control of displays via SPI or the control of a GPS module via the serial interface.