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Fool analog controls with button
jkl:
Hi there,
I recently modded a Dreamcast MadCatz MC2 Wheel for use with my Naomi setup.
Everything is working (I mean if the goal is automatic gearing, since I didn't wired any control for it).
But I wonder if I can have a feature that the wheel has with real Dreamcast, the "full state" of pedals on the buttons built into the wheel. Doing so the pedals are optionals, you can use just the wheel (in this case of course no analog control, you have no gas/full gas as well as no brake/full brake.
Question is: how could I fool the JVS board expecting to have three pins, gnd, vcc, and a variable signal pin (the central one in potentiometers)?
Many thanks in advance,
JKL
Howard_Casto:
Sure... it isn't that hard. Get a resistor the same value as the potentiometer and connect it between the button and vcc and the other end of the button goes to ground. At least I think... machines that use all three pins are a bit tricky, but it is possible. Maybe someone else can chime in on this one.
PL1:
--- Quote from: jkl on November 09, 2015, 03:21:33 pm ---I wonder if I can have a feature that the wheel has with real Dreamcast, the "full state" of pedals on the buttons built into the wheel. Doing so the pedals are optionals, you can use just the wheel (in this case of course no analog control, you have no gas/full gas as well as no brake/full brake.
Question is: how could I fool the JVS board expecting to have three pins, gnd, vcc, and a variable signal pin (the central one in potentiometers)?
--- End quote ---
That sounds like your setup has gas and brake on a single axis like this:
The single axis setup translated into a schematic with the resulting voltages:
- Pink (brake) = Vcc
- Blue/Yellow = Wiper (center pin)
- Blue/Red = Ground
Connect the pushbuttons to these potentiometer leads:
- The brake button shorts Vcc to Wiper when presed.
- The gas button shorts Wiper to ground when pressed.
If the gas and brake functions are swapped (i.e. Vcc on wiper = gas pedal pressed), swap Vcc for ground.
Scott
Edit: Clarified the button connection points.
Howard_Casto:
Glad you chimed in. I didn't have a clue what he was asking, apparently.
jkl:
Many many thanks guys!!
PL1 was absolutely right.
I ripped off my wheel and added 2 momentary buttons behind the wheel, wiring them as PL1 said.
Work like a charm.
I added 2 buttons because I wanted to mantain all the functionality of original Dreamcast wheel, so the orange factory buttons are still working like madcatz did (they're doing it with an integrated circuit).
Many thanks again, you rock!
JKL
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