How to Make External Buttons for Your Keyboard HD

There are times when it would be convenient to have external buttons for your keyboard. So that if what I am building this week. An external button like a foot pedal can let you activate commands while gaming or just let you scroll through Reddit. For step by step instructions, check out the Istructable: http://www.instructables.com/id/Create-External-Buttons-For-Your-Keyboard/