Subject:
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Steppers: was Old Ground
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 8 May 2000 17:46:25 GMT
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Viewed:
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1070 times
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> I know we've been over this before, but I lost all of my old posts
> in a disk crash. I apologize for the redundancy, but has anybody
> figured out a way to drive a stepper from the RCX? And, yes, they are
> the steppers from old 5.25" floppies. I TOLD my wife there was a reason
> I couldn't throw those old machines out!
Dan,
How much of a demand do you think there is for this application? How
much current do the steppers take, and what is their holding ability?
Ther reason I'm asking is that I've developed a servo output driver
circuit for the RCX and made mods to the pbForth firmware to get a
VERY precise waveform between 500 and 2500 usec with 256 discrete
steps.
It would not be much of a stretch to make a software driver that puts
out a specified number of pulses with polarity info to drive a stepper
using a standard driver chip....
The driver would specify a motor output, polarity, and number of steps.
You would be able to query the software and it would tell you when the
steps were done. Maximum step rate would be about 1Khz.
I would want a known good source of stepper motors to make sure everything
worked like it was suppsed to though...
And by the way, throw out the old machines, just keep the drives, they're
smaller!
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Reply to: rhempel at bmts dot com
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Message is in Reply To:
 | | Old Ground
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| I know we've been over this before, but I lost all of my old posts in a disk crash. I apologize for the redundancy, but has anybody figured out a way to drive a stepper from the RCX? And, yes, they are the steppers from old 5.25" floppies. I TOLD (...) (25 years ago, 8-May-00, to lugnet.robotics)
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