Building Raspberry Pi projects is an itch I can never scratch. There’s always something new, something intriguing— a self-hosted service that can save my subscription money, or a cluster project that can integrate several Pis into a formidable unit. Whatever the case may be, building a Raspberry Pi project needs a lot more than you think. You need to attach several additional components to the tiny single-board computer. The situation becomes more demanding when you have multiple Raspberry Pis, each devoted to a single or multiple tasks.