Margaux Baum & Joel Chaffee 
Engineering and Building Robots for Competitions [PDF ebook] 

One of the most hands-on and exciting hobbies and extracurricular activities for students interested in STEM is participating in robotics competitions. This book, newly updated to reflect the latest advances in amateur and professional robotics, including the exploding popularity of the Maker movement, gives readers all they need to enter this competitive and dynamic field. More importantly, readers learn the basics of how to build prize-winning robots, and how to find and enter contests, including local, regional, and national ones.