What I did was copy the code from the Keypad module and added a bit of my own. The result as a very simple system to automatically scan the keyboard every 20hz and then provide key latching. Key latching is a turm I use to say you can set a key as been seen and you will not be notified until that key is released and pressed again. A typical example being in a menu system where you would normally have to put a big delay in to prevent the menu going through every option before you can blink.

At the bottom is the modual and above are 2 examples of it being used.