Do you heard about the Arduino ecosystem and maybe already tried to understand and get familiar with the library without success? Do you think there are too many boards and choose which one fits best to your needs seems hard? Do you want to learn which are the most popular and essential Arduino libraries that help you to build your project without pain? Searching over the Internet for all these pieces of information, without a clear path, can be stressful. Sometimes we start a new project with a specific library and hardware. In the middle of programming, we figure out that we have chosen the wrong library, maintained by no one, and without clear documentation. There are thousands of libraries out there, and filtering the most useful and workings ones is a considerable work. This book has done this work for you.