I've been working in the software business for over 30 years but until recently, hadn't been playing directly with Micro Processors. When I bought a Raspberry PI and then an Arduino, I'm afraid I got hooked. In my house I am surrounded by computers of all shapes, sizes and capacities … any one of them with orders of magnitude more power than any of these small devices … however, I still found myself fascinated.

As I studied the devices, I started to make notes and my pages of notes continued to grow and grow.

This book (if we want to call it that) is my collated and polished version of those notes. Rather than keep them to myself, I offer them to all of us in the Raspberry Pi community in the hope that they will be of some value. My plan is to continue to update this work as we all learn more and share what we find in the community forums. As such, I will re-release the work at regular intervals so please check back at the book's home page for the latest. I do not plan on ever calling this book "finished" as there will always be more to add. Because of the breadth and depth of material that we want to cover, it is unlikely that you will want to read the book linearly from cover to cover. Instead, I recommend that you familiarize yourself with the table of contents and come back to it as and when you need information.