[simpits-tech] Odd control issue with XP...

[Cris Harrison]

dont know if that is the case...  the pot normally has three (3) leads on
it.
1. lets call it the top should go to vcc (power)
2. lets call it the bottom should go to ground.
3. the middle or the slider
so first test the pot out of circuit.
measure ohms between 1 & 2 should be about 10k+/- % (tolerance) (if its a
10k pot) to find the tolerance check with the manufacture normal tolerances
are 1, 5, 10%
also you need to know if the pot has a 'taper' ie Log, etc.
now put your meter between 1 &3 and check range and ends
repeat between 2 & 3.
at the ends you should get very little or no resistance. Ie check the spec.
if the tests differ you might have a badly trimmed pot. (it happens)
some of the pots are real crappy!! remember they where for a game CHEAP!!
I changed out my pots for older Alan Bradley type J they are the best! For
those of you who dont know look here:
http://www.talonix.com/shop/item.aspx?itemid674

Upwards and Onward
enjoy
Cris H.


On Sun, Nov 25, 2012 at 12:37 AM, <dabigboy at cox.net> wrote:

> My first guess would be a bad Plasma (sad!!!!), but I will say I've had
> some weird issues with Windows and joystick device calibration back before
> I switched to Linux.
>
> One thing I can think of: with a traditional 100k pot, for instance, don't
> you usually get *some* voltage at the low end, since it's just a big
> resistor and not actually opening or grounding the circuit? Theoretically
> it still shouldn't act the way it's acting for you, but this *is* Windows
> we're talking about, maybe the unusually low voltage reading from the Hall
> is confusing it. :P
>
> I would plug it into another PC and see what you get, or boot your current
> PC into a Linux boot CD and see if it will calibrate in Linux. Linux seems
> to be a little more tolerant of non-conventional joystick-style controls
> than Windows. Oh, and try different jumper settings on the Plasma...you can
> change the filtering level, as well as the resolution if I remember
> correctly (my Plasma V2 manual is not on this PC).
>
> Matt
>
> ---- geneb <geneb at deltasoft.com> wrote:
> > I'm spending some time tying up the lose ends on the 109F/X controls -
> > I haven't done much with it since I replaced the pots with my diy hall
> > effect sensors.
> >
> > The silly things won't calibrate under Windows XP and my Plasma MM2.
> >
> > I've tested the devices themselves and they range from 0..5V as you go
> > from one extreme to the other - it's about 180 degrees of usable range -
> > I'm only using about the middle 90 or so.  (45 each way)
> >
> > When it calibration mode on XP, I view the raw data to watch for spikes.
> > I don't have a spiking issue, but it appears I've got weird WRAP issue.
> >
> > With the hall effect sensor at a know position (centered @ 2.5V), the
> > joystick calibration window reads about 960 or so.  I would expect it to
> > read about 500-512.  When I move the control one direction, it quickly
> > hits 1023 and wraps back to zero.  It will do this at least twice if not
> > three times before I hit the end of the travel.  It does the same thing
> > going the other way.
> >
> > Any suggestions or has my Plasma MM2 packed it in?
> >
> > Thanks folks!
> >
> > g.
> >
> >
> > --
> > Proud owner of F-15C 80-0007
> > http://www.f15sim.com - The only one of its kind.
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> > Some people collect things for a hobby.  Geeks collect hobbies.
> >
> > ScarletDME - The red hot Data Management Environment
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