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Hi, and welcome to this Instructable.
I built this because I'm going back to school soon and I want to show off to my friends my new cool pencil case!
I will give you an guide on how to build a cool lego pencil case but the finished project may look different to mine as i don't have step by step instructions.
My pencil case includes a hands free opening solution,
a pop out watch and a paper shredder (chainsaw).
It will also automatically shut the lid after 1 minute
I will try to upload the programming sample rbt file as soon as nxtlog approves of my project.
Here is a video to see it in action

Step 1: You Will Need

Lego nxt 2.0 or 1.0,
brain, 
paper,
pens,
a small wristwatch (optional)

Step 2: Step 1

Plan out your pencil case using a piece of paper,
think about the programming and what motor will do, i mean, there is only 3 motors and 4 sensors...
so plan carefully...

Step 3: Step 2

Build the body, this is where the pens and pencils will be stored

Step 4: Step 3

Build the motorized lid that will be triggered by the wave of a hand. 
All thanks to the ultrasonic sensor:)

Step 5: Step 4

Build the clock compartment...
This should act like a lock to the pens and will also pop out when the touch the touch sensor

Step 6: Step 5

BUILD THE PAPER SHREDDER! I CALL IT THE PAPER SAW!

sorry i got excited there but pls pay attention the the gearing ratios

Step 7: Step 6

Programming, I will try and show you the sample program asap, but for now, you can study
the screenshot of my programming:)
Here's some tips,
use the switch block for the clock compartment.
use loops
and make sure the wires are in the correct place

Step 8: Finished!

Now just show off to your friends!
Simply wave your hand in front of the ultrasonic sensor, press touch sensor 1 to move the clock compartment, the press touch sensor 2 to activate the PAPER SHREDDER OF DEATH (USE AT YOUR OWN RISK, I AM NOT RESPONSIBLE FOR YOUR IMPORTANT PAPERS TO BE SHREDDED BECAUSE ITS FUN!)
Enjoy and have fun:)
nice, all that's left is to add legs to this thing...
no more motors left:(

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