Subject:
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Re: Vector2x SPI interrupt driven code
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 5 Mar 1997 23:34:28 GMT
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Original-From:
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Mike Ross <MROSS@OUTLAND.JSC.NASAnospam.GOV>
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Viewed:
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2386 times
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On Wed, 5 Mar 1997, Matt Harlan wrote:
> How close is too close? How far away do you have it? Any problems with
> just pieces of metal, like casters or maybe a gel cel holder. (hint hint)
>
> Sounds like a pretty nifty little device. Just wondering if my setup would
> allow me to use it
From my experience, the calibration is only needed if you need absolute
heading data. Any non-moving metal in the immediate neighborhood will
have a constant effect on the readings. I just care about maintaining the
current heading (go straight) so I don't need absolute data. I have a big
constant-load 24V DC motor going near mine, and the effects seem to
average out, i.e., the heading stays within a degree or two. But if your
metal caster swings around nearby, it will throw your readings off by 30
degrees or more while it's moving. Since a caster doesn't shift around
much, you might find the readings independent of the caster's position, so
long as it is not moving. If so, you could just resolve to only take
readings when stopped and ignore the caster's effects.
I would imagine an accelerating motor would throw off your readings big
time.
* Michael L. Ross/C33 | Lockheed Martin Eng & Sci Svcs Co. ****
* Robotics Department | 2400 Nasa Rd. 1, Houston, TX 77058*****
* (281)333-7094; (281)333-6071 fax* #include <disclaimer.h>*
* Finger me for my public key. mross@outland.jsc.nasa.gov ****
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Message is in Reply To:
 | | Re: Vector2x SPI interrupt driven code
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| Hey Tom How close is too close? How far away do you have it? Any problems with just pieces of metal, like casters or maybe a gel cel holder. (hint hint) Sounds like a pretty nifty little device. Just wondering if my setup would allow me to use it (...) (28 years ago, 5-Mar-97, to lugnet.robotics.handyboard)
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