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Opti-wiz plus STC/Ultimarc trackball - RESOLVED

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squirrellydw:
Any luck yet?

shock_:
Haven't had a chance to do more testing yet.  RandyT has suggested a 2K0 resistor, and Andy thought perhaps a 1K0.  I've bought both and will try and rig up a test board (soldering directly to my harness is driving me nuts) - but in the meantime, my first new PC in over three years arrived yesterday so I'm setting up my new toy!

I'll be out of town this weekend (please, nobody rip off my house okay) so I might not get a chance to progress this until early next week.

RandyT:

--- Quote from: shock_ on November 07, 2007, 07:45:02 pm ---Haven't had a chance to do more testing yet.  RandyT has suggested a 2K0 resistor, and Andy thought perhaps a 1K0.

--- End quote ---

In a case like this, it's usually good to "creep" downward until you get stable operation.  With the 2.2k, you were very close to what would be considered a "logic high", so it shouldn't take much more for it to start working.  Resistors are cheap, so trying a few different values is not cost prohibitive.  Also, if you aren't already, only test on one axis and when you get reliable operation, then use the same value resistors on the other.

RandyT

shock_:
Yep, one axis is what I've been trying.  No patience for two :)

Was thinking I'll grab a bunch of low value resistors and place them in series to find the sweet spot if I need to, as well.

RandyT:

--- Quote from: shock_ on November 08, 2007, 05:00:42 pm ---Was thinking I'll grab a bunch of low value resistors and place them in series to find the sweet spot if I need to, as well.

--- End quote ---

That will probably be overkill :)  If you are grabbing resistors, just grab four of each value in couple hundred K steps, work your way through them and use the highest value that works without jitter.

Keep me posted.

RandyT

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