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LS-30 rotary sticks

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Vigo:


So I decided I am gonna convert a shell cab I have into a vertical SHMUP and rotary dial game cab. I got an old tempest converted to a time soldiers and decided it is not worth my time to do too much with it right now other than clean it up and shove a computer in it.

I am finding I am a complete noob with rotary joysticks. Can someone clarify to me how they work when hooked up to an encoder like the gp-wiz40 with rotary support? I'm finding I am a little confused when it comes to my research on how to hook these up. My understanding was that this is just a 12 pole switch, so why couldn't/wouldn't I just hook up each pole to different inputs on any old encoder?

Last questions, I haven't used the LS-30's on anything but dedicated rotary cabs. These things make decent shmup joysticks? Any good mods out there? Am I gonna regret it if I try to replace the Octogan handle with something else? They are kinda butt ugly.....

Oh, and thanks to whoever put together the LS-30 service page on the wiki. It is great!!

paigeoliver:
I have seem them with round handles as well, although the octagon handle seems to work best with them.

Vigo:
maybe I will give it a shot to just "dress up" the Octogon handles somehow. Something like enamel and clearcoat them to more fitting color and add a decal to the top.  :dunno

BadMouth:
Look at the GPWiz instructions.  There is a wiring diagram there.
http://www.groovygamegear.com/PDF/GP40_Eco_ST.pdf

You group the pins down into 3 wires and the GP wiz can tell which direction it's moving from those 3 wires.
My guess is that it does this by comparing the last pin you were on with the one currently input.
(i.e. if it moves from pin 2 to 1 you are going left, but if it moves from pin 2 to 3, you are going right)
Then it posts the button press that is mapped in MAME to make you turn left or right.

Someone also made a standalone program to do this with any encoder if you have some zd encoders still laying around. 
It's in the software forum.

EDIT: http://forum.arcadecontrols.com/index.php/topic,129020.msg1318799.html#msg1318799

DOUBLE EDIT: BTW I've seen people replace the center cap with the plunger out of a happ button.

Vigo:
Ah! So it is a logical interpretation thing! Beautiful! Exactly what I was getting confused on! I indeed have a couple encoders still lying around, and I will now have a basis to playing with this one. Thanks! :cheers:

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