Raspberry Pi is an inexpensive, simple computer the size of a credit card. It has multiple inputs and outputs, making it the basis for an unlimited number of projects - from creating a Wi-Fi hotspot to thoughtful programmable LED lighting. This guide is the perfect beginner's book that examines how the Raspberry Pi works, how to program it (using Scratch - a visual programming language), how to connect the Raspberry Pi to an existing device, and how to assemble some first basic projects.