Arduino-USB-HID-RetroJoysti.../Keyboard_PS2/README.md

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## PS/2 keyboard as 4 USB-joysticks
![PS2-adapter](https://raw.githubusercontent.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter/master/Images/ps2-keyboard-adapter.jpg)
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.
Joystick 0:
```
arrows = up/down/left/right
R-ctrl = a
alt gr = b
enter = start
R-shift = select
```
Joystick 1:
```
W/S/A/D = up/down/left/right
L-ctrl = a
L-alt = b
tab = start
L-shift = select
```
Joystick 2:
```
I/K/J/L = up/down/left/right
M = a
N = b
O = start
U = select
```
Joystick 3:
```
keypad 8/5/4/6 = up/down/left/right
keypad 0 = a
keypad , = b
keypad enter = start
keypad + = select
```
## Links
http://playground.arduino.cc/Main/PS2Keyboard
http://www.computer-engineering.org/ps2protocol/
http://www.computer-engineering.org/ps2keyboard/scancodes2.html