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Wiring Gas/Brake Pedals, for AndyWarne, UncleT, others?
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Tiger-Heli:
As most of you are probably aware, I believe MAME typicaly wants dual-axis control for Gas/Brake Pedals -  i.e. separate pots control each axis, and the pots can be pressed independently - you can mash the brake with the accelerator floored - would appear in Windows Calibration as gas pedal moves up and down, and brake pedal moves side to side.  But some PC games and most PC pedals are configured in a single-axis mode with the pots feeding into each other - i.e. pressing the brake is the same as releasing the gas - Would appear in Windows Calibration as gas moves cursor up, brake moves cursor down, both pedals up or depressed the same amount leaves cursor centered.

http://www.gunpowder.freeserve.co.uk/wheels/wiring.htm has a simple circuit for switching between the two using a single DPDT switch, but it is set-up for connection to the gameport.

http://dave.bit2000.com/AKIdoc.html has a similar (more complicated) circuit for doing this with the AKI, but it requires an 8-pole dual throw switch, along with two 500-ohm resistors.

I know UncleT was asking about this, and it sounds like he got it working with a Microsoft Dual Strike Hack, but I never saw the circuit posted anywhere.

And I would think it could be done with the A-PAC, but I can't tell from the diagrams on the A-PAC page how you would connect this.

If someone could post diagrams for how to connect this to a dual strike or A-PAC, it would be appreciated.

Thanks!!!
AndyWarne:
There are two ways to do this on the A-PAC. I have tested both. The first way is to use a double-pole changeover switch. I can draw a diagram of this if interested but this second way is better I think:

Wire the pots as normal to the P1 side of the board.
Then connect the following wire links:
1 Right to 2 Up
1 Down to 2 Down
1D to 2D

Then, the P1 side behaves as two independent gas/brake pedals and the P2 side behaves as combined pedals on a single axis. So no switch needed. The other advantage of this method is that you can calibrate each variant independently. This will almost certainly be necessary because pedal pots don't normally go right to the end of the travel.
Andy
Tiger-Heli:
Andy,

That second way is pretty slick 8)

Could you also post (or put on the A-PAC page and link to) the method with the double-pole changeover switch.  (I think some users might want to use that and have another set of pots left over for steering wheel and clutch without having to buy two A-PAC's.

Thanks again!
Flinkly:
or someone could always make an eight axis analog interface board... ;)

you could call it the 8-pac too!
Tiger-Heli:

--- Quote from: Flinkly on April 29, 2005, 02:33:08 pm ---or someone could always make an eight axis analog interface board... ;)

--- End quote ---
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