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The EZ-Expander is an Arduino shield that makes it easy and inexpensive to add digital output pins to your Arduino. This is accomplished by utilizing two 74HC595 shift registers. There are 16 new output pins on the shield (numbered 20-35), and the shield itself uses 3 existing Arduino pins to operate (pins 8, 12, and 13), so overall you get 13 additional output pins to use. I've provided an open source software library that makes it extremely easy to access the new pins 20-35 without having to worry about controlling the shift registers in your Arduino sketch.
Download the EZ-Expander library ZIP file and unzip it in your Arduino sketchbook libraries directory. If the libraries directory doesn't exist you will need to create it. There is a simple example called EZExpanderExample which will now show up in the Arduino application's File->Examples->EZExpander menu.