I like it. A few questions and help.

[Klausus]

Hello. I like your project.
This even serves to be used in a pc, or raspberry as a USB controller adapter (putting it in a 3D printed box).
Or use in a mister fpga also.

PCB doubts:
How big is the pcb ? 68.6x107mm ?
Where can I have it made cheaply?
Do you recommend any website?
For example JLPCB ? (I never printed pcb, sorry 4 questions).

SEGA/DB9 software (Arduino on the right):
I imagine you have used the same pinout as MickGyver's SegaTwoControollers:
https://github.com/MickGyver/DaemonBite-Retro-Controllers-USB/tree/master/SegaTwoControllersUSB

Nintendo Software (Aduino on the left):
If you use MickGyver's software you will only have support for the 2 controllers (the controller pinout in your pcb is snes controllers).

You can try to use Mike11S software which I think uses your same pinout:
https://github.com/MikeS11/DaemonBite-Retro-Controllers-USB/tree/master/DualControllersUSB

If it doesn't work well you have the jroth project for 5 snes controllers (even if you only use 4).
The data pinout of the controllers does not match, you should modify the arudino file to use the same pinout.
https://github.com/jroth/DaemonBite-Retro-Controllers-USB/tree/master/SNESControllersUSB5Player

Note:
I don't know which of the 2 snes projects has a lower input lag.
Mike11S supports NTT controllers and in theory that increases the input lag (that's why MickGyver has 2 SNES versions one with NTT controller support and one without NTT support).

I hope you find the github I mentioned helpful.
Thanks 4 All.

[Arrghus8]

This is great, thanks for the links!

The PCB is 68.7mm x 106.9mm. My main thought is definitely for use with the MiSTer project, but I agree it could easily be used as a generic USB controller adapter. I ordered a batch of 3 on https://aisler.net/ for ~$20 shipped, which seems a decent enough deal to me.

Both Arduinos use MickGyver's code and pinouts. The only changes I made were setting GAMEPAD_COUNT to 4 and added the HID files to the SNES code based on the suggestion from jroth (MickGyver/DaemonBite-Retro-Controllers-USB#3), but I haven't had luck getting all 4 controllers working. At the least, 3 seem to be working fine. I'm definitely interested in trying out jroth's fork.

It would be great if someone could test the latency for all of these options. If there is a noticable increase caused by >2 controllers on one Arduino, I think the most sensible solution would be to add another Arduino.

[ercan1441]

Great project! Are there any gerber files available so that we can order the PCB from eg. JLCPCB?

[dsoms]

Hi @Arrghus8, great project!

Did you get luck getting all 4 controllers working?

I'm thinking on order the PCB. Are you planing to do some modifications?

Thanks!

[Arrghus8]

I haven't had time to work on this lately, but I should be able to return in a month or so. The best I was able to manage before taking a break was getting all 4 ports working, but with only 3 working simultaneously. I still plan to play around with jroth's fork before deciding whether it makes sense to try to fit another Daemonbite adapter. I briefly tried to change his pinout to match the master code, but I'm not familiar enough with Arduino coding to see what my issue was.

I would encourage waiting for a later revision of the board where it will hopefully be in a more usable state. On the other hand, if anyone is interested in building one now, I have two spare boards that I'd be happy to get rid of.

[dsoms]

Thanks @Arrghus8, don't worry and take your time. I'll wait for a later revision of the board ;-)