The book is dedicated to the design of electronic devices based on the Arduino microcontroller platform. Provides basic information about Arduino hardware and software. The principles of programming in the integrated Arduino IDE are outlined. Shows how to analyze electrical circuits, read technical descriptions, and select the right parts for your own projects. Examples of use and descriptions of various sensors, electric motors, servos, indicators, wired and wireless data transfer interfaces are given. Each chapter lists the components used, provides wiring diagrams, and describes program listings in detail. There are links to the book's information support site. The material is focused on the use of simple and inexpensive components for experiments at home. For radio amateurs