The GPIO capability of the Galileo

The Galileo was built to model how the Arduino accesses the outside world. Much of that access should be through the GPIO pins. The Galileo comes with a standard set of 14 digital and 6 analog IO pins, along with some additional pins to provide power and serial IO. Fortunately, the pins are actually well labeled on the board itself.

Here is a close-up:

Here is a list of pins that are available, and a brief description of what each pin can do, starting at the upper right and going clockwise. A more in-depth description of these pins will come later as you actually use them in some example projects:

Galileo Pin	Description
AREF	This pin provides a reference voltage for the analog inputs. The values on the analog pins will be reported in reference to this voltage. You'll also use this in some applications to provide a reference voltage for sensing devices. You can also provide an external reference value to this pin, which means that the numerical values...