Andrew “Bunnie” Huang is a hacker who can’t get enough of hardware. So he has published a book, dubbed The Essential Guide to Electronics in Shenzhen, that will help hardware creators and hobbyists, or makers, navigate the massive supply chain in Shenzhen, China. The book will make it easier to expand the do-it-yourself hardware movement, known as “maker,” that is gaining increasing traction around the world among tech savvy innovators.