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Single Axis pots & A-PAC

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jkl:
Hi all!
I have my driving setup actually working with real arcade hardware using a DB15 connector.
It's a pot for wheel + 2 pots in single axis configuration for pedals.

This is their wiring with real hardware:
- wheel pot: gnd, wiper, vcc
- pedals: wiper 1 for accel, wiper 2 for brake

I have 5 pins on my connector: gnd (common to all pots), vcc (common to all pots), wiper 1 (wheel pot), wiper 2 (accel pot), wiper 3 (brake pot).

I'm looking for a way to connect this setup to an A-PAC and use it with my pc as well, but don't want to rewire it and/or lose my real hardware functionality.
Wheel pot is very easy to wire: just like in ultimarc's examples.
My trouble is how could I wire the 2 pedals' pots in single axis setup... From my connector I can get gnd as for wheel pot, vcc as for wheel pot, and I have the 2 wipers.

I'd like to use my setup with pc games, m2 emu & supermodel. MAME is not my main goal.

If i rearrange the wiring as ultimar suggests I think I'll lose real arcade functionality. This cannot be for sure!

Help please!

Many thanks,
JKL

terminator2k2:
try:

wiring the grounds to the ground connections, all tied together,

wiring the +5v to player 1 left and down and player 2 down.

then the 3 wipers to player 1 right and up and player 2 up.

PL1:

--- Quote from: jkl on December 06, 2015, 04:53:06 pm ---I have 5 pins on my connector: gnd (common to all pots), vcc (common to all pots), wiper 1 (wheel pot), wiper 2 (accel pot), wiper 3 (brake pot).

--- End quote ---
Umm . . . that describes a "dual-axis" setup with separate inputs (wipers) for brake and accelerator -- wire it like terminator2k2 suggested.

If a game requires a "single-axis" setup (one wiper/axis controls both brake and accelerator), you can also wire with an A-pac since it is electrically the same as a single potentiometer.



The single axis setup translated into a schematic with the resulting voltages:
- Pink (brake) = Vcc
- Blue/Yellow = Wiper (center pin)
- Blue/Red = Ground



BTW, If you want to select between single and dual-axis wiring, you can add a 4PDT (or 2 DPDT) relay/switch like the one described here.




Scott

BadMouth:
FYI the pedals must show up as separate for model 2 emulator to work.  You could work around it in software since you don't have force feedback, but it's best if they are kept separate.

Is the connector original?  What game is it?  A few early pc based cabs used a gameport (DB15).  If that is the case, all you need is a usb gameport adapter.  That would be plug and play. 

jkl:
Wheel set is an old Dreamcast's MadCatz MC2 modded to work with my arcade (real) hardware.

I looked my pedals pot wiring.
Pin 1 of pot Accel goes to pin 3 of pot Brake
Pino 1 of pot Brake goes to pin 3 of pot Accel
Individual wipers are separate.

Look at the picture below.

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