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When you are done you will end up with a Mini Multi-Touch Interface. For more information on what these do click here.
You will need
a screw driver (Phillips)
some knowledge of mechanics
the patience of a saint
The scanner before I began working on it.
Step 1: Time to harvest - retrieving your parts
Only part from the scanner you will really NEED is the case. Also you will need a small webcam that you don't mind never seeing again (I went out and bought a $2.50 pink one at Walmart just so I wouldn't have to see it in the electronics isle anymore).
Originally I was hoping to use the scanners built-in processor to do the work so that you wouldn't need anything else, but since I don't have a Win95 handy and I don't want to program new drivers for an extinct piece of harware, it's worth the $2.50 until I get a newer scanner that I can take apart.
Note: You don't have to take your webcam apart, but I took mine apart because I wanted to add some more electronics to the circuit like a power light on the case and maybe some other fun gadgets. If you DO take it apart be careful to leave the built in lense cover on; i took mine off the first one to take pictures and had to get a new one because I couldn't get it clean after dust decided to settle on it.