This book teaches the fundamentals of electronics and embedded systems for folks who are comfortable with basic JavaScript but who may have no experience what-so-ever wiring up even the simplest circuit. Emphasis is put on the topics that will be new to software developers: the critical basics of designing and building circuits, hardware components (sensors, motors, resistors and the like) and the interface between hard-ware and software. Over the course of this book, you’ll get hands-on with a variety of development boards, hardware components and software platforms. For the experiments (small projects) in the first two-thirds of the book, we’ll use the Johnny-Five open source Node.js framework with the Arduino Uno development board. Johnny-Five’s API pro-vides many intuitive component classes that you can use to quickly prototype your gadgets and inventions.