Subject:
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Re: ROM stuff: Better than PWM
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 19 Dec 1998 09:05:34 GMT
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Original-From:
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Ben Laurie <ben@algroup.^NoMoreSpam^co.uk>
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Viewed:
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1174 times
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Kekoa Proudfoot wrote:
> every 1/1000th sec:
> count += p
> if (count >= n)
> turn motor on
> count -= n
> else
> turn motor off
>
> That's it.
>
> I'm sure this algorithm has been thought of before; I got the idea from
> Bresenham's line drawing algorithm and from the Floyd-Steinberg error
> diffusion dithering algorithm, but I believe this algorithm is a typical
> one used in one-bit D/A converters.
Funny - I was thinking of doing exactly the same thing - and also basing
it on Bresenham. I've always wondered about 1-bit D/A, but if you
actually read the docco it is wrapped up in so much weird signal theory
it is very hard to understand (at least the ones I've read).
Cheers,
Ben.
--
Ben Laurie |Phone: +44 (181) 735 0686| Apache Group member
Freelance Consultant |Fax: +44 (181) 735 0689|http://www.apache.org/
and Technical Director|Email: ben@algroup.co.uk |
A.L. Digital Ltd, |Apache-SSL author http://www.apache-ssl.org/
London, England. |"Apache: TDG" http://www.ora.com/catalog/apache/
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Message is in Reply To:
 | | ROM stuff: Better than PWM
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| So I was thinking about writing a motor driver that is better than what is in the ROM already. Here's the problem: You have a function called once every 1/1000th of a second. You want to allow n speeds of the motor at minimal cost in lookup tables. (...) (26 years ago, 19-Dec-98, to lugnet.robotics)
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