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'Multiplexing stepping motors'
1996\08\31@051005 by rrose

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I've have made a prototype stepper motor circuit using the design
provided in the Basic Stamp app notes utilizing the ULN2003.

No problems -- it works fine.

Now, I would like expand the concept to be able to drive five (or
even six) stepper motors off of a single processor.  I however, don't
have enough available pins to control each motor directly.   I was
hoping to multiplex the pins.  My thought was to use two pins to
control the stepping and five pins to select the individual motor in
question.

My attempts to achieve this goal has not been successfully.  I was
wondering if anyone have any solutions?

TIA,


Richard Rosenheim
spam_OUTrroseTakeThisOuTspamaccessnv.com

1996\08\31@201145 by Todd Peterson

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At 02:08 AM 8/31/96 -0800, you wrote:

>Now, I would like expand the concept to be able to drive five (or
>even six) stepper motors off of a single processor.  I however, don't
>have enough available pins to control each motor directly.   I was
>hoping to multiplex the pins.  My thought was to use two pins to
>control the stepping and five pins to select the individual motor in
>question.

We are offering a parts kit that might be just what you need.  It actually
consists of a pre-programmed PIC16C54 with four power transistors and
diodes.  the PIC acts as a stepper motor controller, allowing full & half
stepping, direction control, 8-speed self clocking or external clocking,
free-spin, etc.  Each chip comes with data sheet and hookup diagram as well.

Please feel free to contact me directly (don't reply to list) for more
information.

Todd Peterson
E-LAB Digital Engineering, Inc.

(712) 944-5344
.....tpetersonKILLspamspam@spam@netins.net


'Multiplexing stepping motors'
1996\09\02@035527 by liebchen
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Richard Rosenheim wrote:
>
> I've have made a prototype stepper motor circuit using the design
> provided in the Basic Stamp app notes utilizing the ULN2003.
> ...
> Now, I would like expand the concept to be able to drive five (or
> even six) stepper motors off of a single processor.  I however, don't
> ...

Hi Richard,

you could use serial shift registers with parallel outputs (74LS595)
to control x times 8 lines. They can be cascaded, so you need only
three port pins (clock, data, latch). You have no indefinit states
as the new information is latched at the same time on all parallel
output lines.
Six stepper motors = 24 drivers = 3 times 74LS595

Wolfram

--

+------------------------------------------------+
! Wolfram Liebchen, Forschungsinstitut fŸr Optik !
! liebchenspamKILLspamipserv.ffo.fgan.de             !
+------------------------------------------------+

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