Arduino Workshop, 2nd Edition

21 The Internet

In this chapter you will

• Build a web server to display data on a web page
• Use your Arduino to send tweets on Twitter
• Remotely control Arduino digital outputs from a web browser

This chapter will show you how to connect your Arduino to the outside world via the internet. This allows you to broadcast data from your Arduino and remotely control your Arduino from a web browser.

What You’ll Need

To build these internet-related projects, you will need some common hardware, a cable, and some information.

Let’s start with the hardware. You’ll need an Ethernet shield with the W5100 controller chip. You have two options to consider: you can use the genuine Arduino-brand Ethernet shield, as shown in Figure 21-1, or you can use an Arduino ...