Arduino is a powerful electronic prototyping platform used by over one million people around the world. The Arduino Ethernet shield is the perfect addition to the Arduino platform to get it connected to your local network and to the Web in minutes. This book covers several projects you can build using the Arduino Ethernet shield. These projects are organized in three parts. The first part of the book will cover the basics of the Ethernet shield and the Ethernet library, such as how to run an Ethernet client that sends data to a server on your computer. The second part will make the Arduino and Ethernet shield more independent by running a web server on the Arduino board. You will learn how to create, record, and visualize data using Xively service.