Buttons on GPIO pins

Button 1 : GPIO 30+32 Button 2 : GPIO 34+36 (these pins are next to usb plugs, to the exterior side, leave the 2 last pins unused)

DSLR

I've bought an AC plug to keep my DSLR always on. I've changed the parameter to avoid automatic shutdown of the DSLR and the flash (custom function to enable). Connect the DSLR and the rapsberry with an USB cable.