There are both software and hardware requirements for this book. On the whole I have tried to use electronic components that are included in the Arduino starter kit. There are a few chapters where this hasn’t been possible, and in those cases I have tried to keep to components that are cheaper and commonly available. Appendix A lists some suppliers of Arduino Components.You will be using a number of JavaScript libraries in this book, and these libraries are constantly updated. I have worked with the same version number of the libraries throughout the book and have listed the version number needed. Though these will not be the latest version for a library, they do all work together. As different people write the libraries, updates to one can break how it works with another.You will need a code text editor to write your code, and there area number available online that can be downloaded such as SublimeText, Atom, and Visual Studio code. Different developers will prefer different editors, and some are geared more toward certain programming languages.