[simpits-tech] Using Pots for position sensing (part 2)
Sean Galbraith
sean.g at paradise.net.nz
Thu Dec 4 10:34:25 PST 2008
At 04:08 a.m. 5/12/2008, you wrote:
> >
> > The only issue now is one of resolution... hmm... I need some cunning
> > rather than time-consuming engineering.
> >
>
>Roy, the only way you're going to increase the resolution is to increase
>the sample size. I suspect that the logitech stick uses a three wire pot,
>in which case it's configured as a voltage divider. Most off the shelf
>joystick use a 10 bit sample rate which will give you a resolution of 0 to
>1024. This is of course a huge improvement over the old style "analog"
>joysticks that PCs used to use - those were 8 bit samples. (0..255).
>
>If you want to go to a 12 bit sample size, you can get one of Leo Bodnar's
>BU0836A controllers. They provide for 8 axes and 32 button inputs and the
>sample range is 0..4096. This should be plenty for what you're trying to
>do. The good thing is that he's local to you and the device is listed as
>(insert funny pound sign here)24.
>
>Here's a link to the '386A: http://www.leobodnar.com/products/BU0836A/
I can only add a "use them they are great" comment... I've used a
couple of Leo's boards now and have no reason to not keep on buying
them! I like the "X" version (which I haven't bought yet) which has
really simple push connectors... brilliant for a relatively simple,
or quick project
SeanG
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