PS/2 keyboard as 4 USB-joysticks
Needs Atmega32u4 (e.g. Arduino Leonardo).
PS/2 is 5V.
Needs custom ps2-library (PS2Keyboard_mcgurk.zip, unzip to libraries-folder).
Clock-signal must be in pin 2 (because of interrupts).
Edit button assignments manually. Assignments are in the end of source file.
#define DEBUG if you want to see codes in console.
arrows = up/down/left/right R-ctrl = a alt gr = b enter = start R-shift = select
W/S/A/D = up/down/left/right L-ctrl = a L-alt = b tab = start L-shift = select
I/K/J/L = up/down/left/right M = a N = b O = start U = select
keypad 8/5/4/6 = up/down/left/right keypad 0 = a keypad , = b keypad enter = start keypad + = select