I got the PCB for the PI2 / PI B+ arcade controller adapter the other day. I have actually soldered one together and I will test this as soon as I find my Pi B+ board that seems to have grown feet. Or maybe I should buy a new Pi2 instead…
Well, here is an image of the unpopulated PCB.
It gives you joystick + 6 buttons per player as well as coin, 1P, 2P, Esc and two general inputs. This board is yet untested.
Previously I did a similar board for the older Pi. This is for one player only.