Chapter 2. Accessing the GPIO Pins

Now that you are familiar with the Galileo IDE and know how to create, edit, and upload a program, this chapter will now focus on hardware. You'll learn about the capabilities of the General Purpose Input/Output (GPIO) pins and how you can connect to and access them via software. Specifically, you'll learn about the following:

• The GPIO pins, what they can and can't do
• How to use and access them using some very basic circuits and very simple programming examples that demonstrate how to make the Galileo access the outside world