need help to make a game controller usable for PC

hello everyone,

first of all, i'm newbie in whole electronic thing, i'm interested , bought arduino learn. dont judge me, okay? 

i want have done. want make special wii game controller usable pc. in other words, arduino should current state if pressed or not.  drum controller music game (its drums game drum rocker)

i disassebled drum , inside, looks this:
http://i60.tinypic.com/whz1x4.jpg

the wire on right side goes wii controller, extention nunchuck energy.
i cut wire on right side on end. don't know if guys can read it, on right sides, pins labeled as
gnd  (ground)
gnd (ground)
scl (datastream?)
sda (datastream?)
det (det = detection?)
vdd (power)

i put vdd wire 3.3v port , gnd gnd (doh). , scl, sda, det analog port.
then tried read data scl, sda , det. of them give "685~687" no matter if press on sensor or not.

how can work?

thank guys

i love enthusiasm, have slow down bit.

the best thing do, find project else has made that.

there many possibilities, have know want achieve.
do want arduino emulate key or mouse presses computer ?
that possible arduino leonardo, , micro , esplora.
http://arduino.cc/en/main/arduinoboardleonardo
http://arduino.cc/en/main/arduinoboardmicro
http://arduino.cc/en/main/arduinoboardesplora     <-- sure have @ one

or want wii compatible arduino ?

the sda , scl i2c bus. in arduino called 'wire'.
http://en.wikipedia.org/wiki/i%c2%b2c
http://arduino.cc/en/reference/wire

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