Hardware GC Adapter and Arduino Setup - Send controller input instead of read it

[Bgeo25]

Hello,

I am attempting to send GameCube controller input data in the form of bytes from a computer connected to an Arduino Uno to each of the colored wires where I split the male and female parts of a GameCube cable. The male end of the cable will eventually connect with my Mayflash GC to Wii U adapter. (See the below diagram in image since it's easier to illustrate what I'm trying to do.)

[Original setup from: https://github.com/jaburns/NintendoSpy/blob/master/docs/tutorial-gamecube.md]
Image: https://s10.postimg.org/h9b4yjp7t/GC_Setup.jpg

There are multiple tutorials detailing how to read GC controller inputs (still using an Arduino) from a physical controller, but I want to emulate the GC controller by sending the input data to the male end of the cable directly from the computer/Arduino setup. Are Arduino pins even capable of doing this?

What would be the best way to accomplish this connection and transmission?

 

[hippy dave]

I don't know anything about the controller's comms protocol etc, but an alternative to recreating that would be to attach the arduino's outputs to a circuit board taken from a GC controller, so you just have to switch on/off for each button, and a variable voltage or whatever for analogs. I don't know if the arduino has enough outputs, or if this would be any easier than doing it the other way.

 

[Bgeo25]

I don't know anything about the controller's comms protocol etc, but an alternative to recreating that would be to attach the arduino's outputs to a circuit board taken from a GC controller, so you just have to switch on/off for each button, and a variable voltage or whatever for analogs. I don't know if the arduino has enough outputs, or if this would be any easier than doing it the other way.

Thanks for the reply.

Unfortunately, I don't have a GC controller or any spare parts, but wanted to "emulate" it by sending the input data from computer to GC cable. I guess the Arduino would have enough outputs to help me cover all of the GC controller layout, but (basically), I don't know what kind of data I'd be sending. If I send 3.3V from one of the Arduino's digital pins along the bi-directional data line (as shown by: http://www.int03.co.uk/crema/hardware/gamecube/gc-control.html), how would a game (e.g. SSB4) know the difference between me pressing A and pressing X? There would be no way of distinguishing the buttons just by applying voltage.

 

[hippy dave]

Yeah, it's presumably using some kind of serial protocol, so you'd have to encode the button presses into a serial data stream. You could try and figure it out by reading the code for receiving from a GC controller, or Google for documentation.