Subject:
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Re: Homebrew rotation sensor idea
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 21 Nov 1999 21:32:52 GMT
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Viewed:
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599 times
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Welcome aboard, Dave (and David). Sounds like a pretty good idea, but one
caveats: if you plan on using the standard light sensor, be aware that it
does not (in my experience) give constant readings: i.e., point it at a
spot on a wall and let it sit. Readings will vary up or down by as much as
two percent each way, giving you a total 4-5% error. Also, readings
aren't necessarily linear, so that might also limit your reliability. Of
course, if you do it completely yourself, then you might get
substantially better results. Good luck with it, either way- sounds like
a very nice solution to an important problem.
-Luis
Of course, if you are going to completely
On Sun, 21 Nov 1999, Dave Johnson wrote:
> Awkward, perhaps, but depending on the sensitivity of the light sensor
> you use, it seems to me it might provide pretty good resolution, probably
> much better than the 22.5 degress of lego's rotation sensor. You would
> have to track history to know where you were in an absolute sense (the
> pattern inverts every 90 degrees, repeats every 180).
>
> I suspect you could package the whole thing neatly in a few bricks, if
> you used an led light source and made it a powered sensor.
>
> Any thoughts on this? Anyone tried anything similar? Any other uses for
> polarized film you can think of?
>
> Dave Johnson
>
> -------
> Background:
>
> Robotics: Been dabbling for years, and have even won 2 robotics
> competitions. (But don't read too much into that: for the 1987 San
> Francisco Robot Olympics I built a simple line follower but mine was the
> ONLY autonomous entry, and the scoring was slanted heavily in favor of
> autonomy. The second was a lego robotics competition at Alife II put on
> by Fred Martin, and we won - I was working with a partner, Eric Cooper -
> simply because our 'bot completed all three tasks successfully. But the
> robot itself, frankly, was boring, so utilitarian as to be yawningly
> dull. If there would have been scoring for creativity, we'd have been
> near the bottom, there were some truly amazing creations there.)
>
> Electronics: Lots of classes in college, lots of dabbling myself, and for
> the last year have been a real live hardware guy, designing handheld data
> acquisition systems for Palm-based computers.
>
> Mechanics: Deep love of all things mechanical all my life. I was a
> mechanical guy for the ILM creature shop in a former life, but I own no
> machine tools of my own (something I hope to rectify someday: those
> Sherline mills look lovely.)
>
> Computing: Been a programmer since the early 80's in college (FORTH,
> Fortran), but personal computers didn't do anything for me at all until I
> saw a Macintosh for the first time. I've been an avid Mac programmer
> since 1985 (mostly C and C++ the last 8 years or so), and worked at Apple
> for many many years in Developer Support. Also quite a bit of assembly
> language experience, especially on 80xx in college, and on PICs over the
> last year, for work.
>
> Lego: Total Newbie, but I'm hoping that will change quickly.
>
>
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Message is in Reply To:
 | | Homebrew rotation sensor idea
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| Hi All, New guy here (some background below, if you're interested), been lurking for a week or so, and I'm off to buy my 1st Mindstorms set as soon as Toys 'R Us opens this morning...they have both 1.0 and 1.5 on the shelf, I'll be getting 1.0 after (...) (25 years ago, 21-Nov-99, to lugnet.robotics)
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