Hi,

I have few questions about God_of_CPU's steering wheel control implemenation.

1. My understanding for GOC's SWC design is that it is all or nothing. Meaning when the relay is switched, all buttons will either control the headunit or carputer, but not partially to both? What I like to do is to retain the control of "mode" and "volume" to the headunit while the "track" and "power" buttons will control the carputer. Is it possbile? I am guessing not since headunit is expecting ground from SWC wire while gameport/gamepad is expecting voltage? Just want to ask to confirm, there may be some creative pplz out there

2. In GOC's original design, the switch in relay is activated by supplying 12v from carputer's PSU. This means SWC will control carputer when it is power on. Since I have a AAI-NIS I want to trigger the relay switching when headunit is in AUX1 input. To do this I think I can use the remote wire from AAI-NIS. The AAI-NIS's remote wire will provide a negative output when headunit is in AUX 1 mode. So should I connect the relay to radio's 12v and the ground to AAI-NIS's remote wire? will this work?

 

Id like to do the same thing as you regarding not doing the volume but I dont know if its possible

The SWC output is two wire (A and B) plus a ground
A handles mode, seek up and vol up
B handles power, seek down and vol down

So the functions are all on the same wire so you can't just leave off one of the inputs. Maybe god_of_cpu will chime in and give the final word on whether thats possible or not (Im leaning towards no)



The remote wire will work just fine and it seems to be to be a better solution
Heres a modified diagram with that

 

Thanks dwoloz

I've chosen to hack a gamepad because a lot of pplz reported problem with the usb->gameport adapter. I got a Logitech wingman for <$10 shipped. The problem now is I don’t know how to connect this...

There are two PCB in the gamepad, the main PCB which housed everything (direction and push buttons) and a smaller PCB that housed the two analog controls (Shown in pic below). There is a 5 wires ribbon to connect between the two PCBs.

pic of the analog stick board (front/back)


<Pin layout of the 5 wire ribbon:>
PIN (1): power +5v
PIN (2) to (5): Input for each of the analog axis. There are two analog sticks on this controller thus there are 4 inputs.

<measurement>
1. Connect Pin 1 to GND = 4.9v

2. Connect Pin (2 ~ 5) to Pin 1 = 0.03v
-Moving the analog stick from left to right the voltage between pin1 and 4 will vary from 0.01v to 0.05v.

3. Connect Pin (2 ~ 5) to GND = 4.86v
-Moving the analog stick doesn’t affect the voltage at all. I though the voltage here should change as I moved the analog stick but it doesn't? So what I dont understand is rather power is supplying thru (2 ~ 5)?

Should I check something else like resistance? Any suggestion on how I should connect this to SWC?