In this book, our major concentration is on Arduino Uno, which makes use of the AtMega328 microcontroller. This is one of the most widely used boards across the world. It supports the interfaces with discrete components as well as various types of shields. The objective of this book is to introduce Arduino and its interface with several modules. The programming can be done by using Arduino IDE and it is open-source software. Arduino for Beginners is very suitable for all kinds of people interested in doing electronics-based projects.