Super Nintendo / Arduino Leonardo Controller

This project turns a super nintendo controller into a "keyboard" with an arduino leonardo, allowing it to be easily used in an emulator environment.

Wiring

The Super Nintendo controller plug can be wired to the Arduino in the following way:

 ---------------------------------- ---------------------
|                                  |                      \
|  [+5v]    [7]     [5]    [6]     |  [x]    [x]    [Gnd]  |
|                                  |                      /
 ---------------------------------- ---------------------

The pins marked with Xs should not be wired to anything, as they are not used.

Keyboard out

When the sketch is uploaded and the arduino leonardo is running, the controller will output the following keys when the SNES buttons are pressed:

    +----------+---------------+
    |   Button | Key           |
    +----------+---------------+
    |     B    |      S        |
    |     Y    |      A        |
    |  Select  |  Right Shift  |
    |   Start  |    Enter      |
    |    Up    |      Up       |
    |   Down   |     Down      |
    |   Left   |     Left      |
    |  Right   |    Right      |
    |     A    |      D        |
    |     X    |      W        |
    |     L    |      E        |
    |     R    |      Q        |
    +----------+---------------+

Which can be remapped in the emulator, or changed inside the sketch.

Further reading

https://gamefaqs.gamespot.com/snes/916396-super-nintendo/faqs/5395

Was a really great resource for understanding how the communication/timing for the controller works.