First attempt to make the stepper motor turn !! Wasn't really concluant because we spent a lot of time studying the driver needed for the Nema17. The first choice was the DRV4980 but we couldn't find the wiring diagram for it. So we went and choose a A49800 stepper driver. We then used a shield capacitor support that looks like the following picture. 

But why did we fail our first attempt ? Well we just installed the chip in the wrong direction on the support...It turns out the dir pin couldn't handle a 9V input (sad if you ask me). So see you in two weeks for more advancement (finally some mouvement). Below you can see what the driver A4980 looks like.