Reprogrammable 4 digit keypad using 4-Bit Binary

[ARitz Cracker]

Hello Fellow Facepunch Minecrafters! Today I'd like to show off my new 4 digit keypad that uses 4 bit Binary numbers.

(Pictures are clickable)

Here's some pictures of the user interface.
[quote]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.38.45.png[/IMG]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.38.58.png[/IMG]
The wire on the right is the output
[/quote]
As you can see, there's a large cable running out of the keypad.

The actual computer for the thing is over there.
[quote]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.39.12.png[/IMG]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.39.28.png[/IMG]
[/quote]

From there it leads to here
[quote]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.39.41.png[/IMG]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.39.50.png[/IMG]
[/quote]

Here's an overall view of the thing, The left half contains the digit the user entered, the right half contains the combination that has already been programmed, and the bottom half keeps track on which digit the user is currently typing in.
[quote]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.39.58.png[/IMG]
[/quote]

In between the 2 series of memory modules are a series of XNOR gates and AND gates to check if all the digits that the user entered are equal to the digits stored in memory.
[quote]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.40.15.png[/IMG]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.40.25.png[/IMG]
[/quote]

Here's a more closeup view of the digit counter
[quote]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.40.39.png[/IMG]
[/quote]

This is where you program in the combination you wish to use
[quote]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.40.47.png[/IMG]
[IMG]https://dl.dropboxusercontent.com/u/14940709/imgs/keypad/2013-04-17_22.41.23.png[/IMG]
[/quote]

[video=youtube;8rrl71BYmAY]http://www.youtube.com/watch?v=8rrl71BYmAY[/video]
Video may still be uploading...

Any questions? Feel free to ask!