We present to our readers a book about digital electronics. “From simple to complex” examines code examples and connection diagrams for the most popular components: Arduino, Raspberry Pi, BBC Micro:bit, ESP and ESP32, and the “classic” type NE555 is not forgotten. Connection methods and examples of using various modules are also discussed: LCD screens, real-time clocks, motor control, etc.

The book is designed for those starting their journey in mastering electronics, and for schoolchildren from 10-12 years old. Therefore, the theory is given in a minimal amount, and the main emphasis is on practical exercises.

The book is distributed free of charge in electronic form, the latest version can be downloaded at https://cloud.mail.ru/public/F6Vf/nY6iSxXcd. To preserve the formatting of the text and code, it is recommended to select the PDF format for reading.

Text version 1.4.

Contents

Part 1. Basics of Electronics - Parts and Tools - Electrical circuit - Measurements - Symbols on diagrams - Experiments with LED - Experiments with capacitors - NE555 microcircuit - Field-effect and bipolar transistors

Part 2. Using Arduino - Basics of the C language - Data types in Arduino - Flashing the LED - Width - pulse modulation - Data output via Serial port - Button press detection - Input of analog values - Audio output - DS1820 temperature sensor - Connecting an OLED screen - Connecting a gyroscope, compass and accelerometer - Real time clock (RTC) - Connecting an ultrasonic range finder - Connecting a motor control module - Multiwii - making a quadcopter - Internet access: ESP Serial to WiFi

Part 3. ESP32 - General introduction - I/O ports - Connect to WiFi - Connect the display - Get the time from the atomic clock - Display the number of friends in “Contact” - We display the number of subscribers, views and likes on Youtube - We launch our own Web server - We control the LED via the Web - We display images on the web server - Remote monitoring - We make a one-way messenger - Cloud services: we send data via Dropbox

Part 4. Single board computer with Linux Raspberry Pi - General introduction - System setup - Basic Linux commands - Python language basics - GPIO: input/output ports - Using I2C - Connecting an OLED display - Connecting buttons - Going to the Web: make requests to the server - Launch your HTTP server - Remote control from a smartphone - Connect a webcam - Launch video surveillance - Time-lapse photography - Connect to the camera using OpenCV - Launch a video broadcast server - Send data via Dropbox - Face recognition using OpenCV

Part 5. BBC Micro:bit - a computer for the little ones - Introduction - The first program for BBC Micro:bit - I/O capabilities - Controlling board tilts - using the accelerometer - Game “Snake” - Playing sound - Using the radio module - Using the serial port - Connecting external devices