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'encoder positioning disks'
1999\10\22@173038 by TIM

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Hello all....
Where can i  find  encoder positioning disks...really cheap?
the kind i'm looking for is a clear plastic disk with darkened positioning
lines ..and a hub that i can set screw to a 1/4 inch shaft?
any help will be appreciated...and the plans will use  a pic chip
also..........thx in advance................Tim.

1999\10\22@173704 by John Mitchell

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On Fri, 22 Oct 1999, TIM wrote:

> Hello all....
> Where can i  find  encoder positioning disks...really cheap?

hack a mouse, you'll get ~2.  a PIC, also, probably :)

- j

1999\10\22@203227 by Keith Causey

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If you can live with slots instead of clear plastic then cannabilize a
mouse. There are two little encoder disks in each one. There are also all
the associated optoelectronics. Actually there's a reader/controller in
there too. It's probably easy to figure out what it's doing and the current
requirments are miniscule. If you still want to roll your own Microchip has
an application note on how to use a PIC for a mouse controller which
contains all the subroutines. That can be stripped down to what you need.
Good luck - Keith Causey

> Hello all....
> Where can i  find  encoder positioning disks...really cheap?
> the kind i'm looking for is a clear plastic disk with darkened positioning
> lines ..and a hub that i can set screw to a 1/4 inch shaft?
> any help will be appreciated...and the plans will use  a pic chip
> also..........thx in advance................Tim.

1999\10\23@030647 by Anne Ogborn

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Alltronics can probably sell you one cheap.

Actually, the mouse idea has more general application.

I've no illusions how much engineering time costs, and
like to build things out of already done 'nearby' solutions.

Come to think of it, a mouse is just a 2 axis delta position encoder, yah?
Nice part is, you can just plug it into a cheap PC. Somewhere in
the SDK is an API (SetCursorPos) for 'jumping' the mouse (you have to
do a SetCapture to keep getting events after it leaves your window).
I remember being incredibly
disgusted when I found UI guidelines for using it in the CUA/SAA.
:op  terrible thing to do to a user. But you could use it to get 2 axis
quadrature input - jump to center screen, and when mouse rolls
outside a box, jump back in, but keep a separate delta.

And, you can replace the actual quadrature with whatever you want -
a big encoder wheel with lots of positions for fine sensing, maybe use
the buttons to detect a 'zero'.

hmmm.... and no low level software to write (always a big plus with Annie).

Indeed, I've got an application for this right now - I want to get some data
into Java from the outside world. I'm none too keen on using the javax.comm
suite, and via JNI looks like a pain.

Sooo.....

I'll chop up an old mouse, and just use the quadrature. 8o)
(still gotta do JNI to get to the 'SetCursorPos' API, but it's a lot
easier).

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