Arduino Project Handbook by Mark Geddes contains 25 practical, step-by-step projects for the Arduino Uno, aimed at beginners who want to learn electronics by building things. After a getting started section on the Arduino IDE, breadboards, soldering and safety, the projects are grouped into LEDs, sound, servos, LCD screens, numeric counters, security and advanced builds. Examples include a light dimmer, plant monitor, memory game, secret knock lock, joystick-controlled laser, weather station, reaction timer, electronic die, motion sensor alarm, keypad and RFID entry systems and a rainbow light show. Each project lists the parts, wiring diagrams and sketch code, and the book ends with building your own Arduino.