I needed to be able to turn the page in a sheet music organizer I made ( http://www.gschoppe.com/repertoire ), without stopping playing. After a bit of thought, this usb foot pedal was born. Some companies sell these for over $200. Mine cost $30-$40 to make.

Step 1: Purchase Materials

The main materials used were:

-2 SPST momentary switches from RadioShack
-1 RadioShack Project Box
-1 Mobility USB 2.0 Travel Hub (staples SKU #564851)
-1 GE retractable keypad (staples SKU #603891)
-1/16" sheet steel
-1 superpad extra large mousepad (staples again)

I also used:

-electrical tape
-metal screws
-cyanoacrylate(super glue)
-3m super 77 spray adhesive
AND
-conductive epoxy (if you're prepared)
OR
-hot glue and a circuit writer pen from radio shack (if you're down and dirty)

I'll add part numbers soon, but thats what I needed.

for tools, I used:

-a dremel
-a table saw
-a file
-a drill
-an adjustable wrench
-wire strippers
-soldering iron
-screw drivers
-basically, a well stocked workbench.

OK, now lets get down to buisness.

Step 2: Remove All Casings

remove the casing of the hub and keypad. remove the circuit boards, and use electrical tape to isolate them and stack them in a neat bundle.

Step 3: Connect Wires to the Keypad

remove the film contacts from the keypad. Counting from the little plus sign, you need to connect to traces 2, 5, and 6.

you can now cut the film to size, and use conductive adhesive (or a circuitwriter and hot glue if you're lazy like me) to connect 1 lead to trace 2, 2 leads to trace 5, and 1 lead to trace 6.

at this point you can connect everything and test.

touching 2 and 5 should yield a 6, or a right arrow
touching 5 and 6 should yield a 4, or a left arrow

disconnect and continue...

Step 4: Cut and Drill

now you need to cut the project box on a bias, measure and slot for the connections to the hub, and drill and mount the switches. Whew, that went fast, didn't it.

you'll also need to cut down some posts to fit everything inside.

really, cut and fit to feel... and take your time

Step 5: Cut the Base

measure, cut and drill your steel base plate...
also measure and cut your non-slip surface (the mousepad)

measure large; its almost impossible to cut a mousepad exactly

Step 6: Assemble the Innards

stick the innards together, test, and super glue to the metal base, after double checking your electrical tape insulation.

then, connect the switches, solder, and screw it shut.