Chapter 15. Ethernet and Networking

15.0. Introduction

Want to share your sensor data? Let other people take control of your Arduino’s actions? Your Arduino can communicate with a broader world over Ethernet and networks. This chapter describes the many ways you can use Arduino with the Internet. It has examples that demonstrate how to build and use web clients and servers and it shows how to use the most common Internet communication protocols with Arduino.

The Internet allows a client (e.g., your web browser) to request information from a server (a web server or other Internet service provider). This chapter contains recipes showing how to make an Internet client that retrieves information from a service such as Google or Yahoo! Other recipes in this chapter show how Arduino can be an Internet server that provides information to clients using Internet protocols and act as a web server that creates pages for viewing in web browsers.

The Arduino Ethernet library supports a range of methods (protocols) that enable your sketches to be an Internet client or a server. The Ethernet library uses the suite of standard Internet protocols, and most of the low-level plumbing is hidden. Getting your clients or servers up and running and doing useful tasks will require some understanding of the basics of network addressing and protocols, and you may want to consult one of the many references available online or one of these introductory books:

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