Subject:
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Re: V2X Compass
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 4 Mar 1998 00:33:37 GMT
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Original-From:
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Kent Farnsworth <AKENT@ihatespamBGA.COM>
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Viewed:
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1427 times
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Hello all:
I played with the V2X a year or so ago, and found that virtually anything
magnetic interferes with readings. I found that the wiring in my office
created false readings when the compass was moved around, especially if
close to the walls. Sometimes the heading would shift 180 degrees, when near
an operating wall outlet. I have two units, and each behaved the same.
Outside, there was no problem at all. They measured perfectly. These things
(at least mine) are very sensitive. I would imagine that permanent magnet
motors would also create a similar problem. I never mounted one in my bot,
as I thought there would be a major problem in navigation, due to the wall
wiring electromagnetism, as I like to run my bots indoors.
Maybe yours are newer and improved versions, to where this is not so much a
problem. I would love to here if this is the case.
I would really appreciate any new information on ways to improve these
units. They definitely have major potential.
Kent
At 07:56 AM 3/3/98 -0600, you wrote:
> Bill,
> I have not been able to try that with the v2x onboard the bot so far, every
> time I try to load anything while the v2x is running my handyboard wants to
> crash.
> Someone out there must have a code that they would be willing to share with
> some of us less experienced IC furture code writers.
> I plan to mount the v2x as far from the motors as possible even if it means
> mounting on some type of mast and trying to shield it someway. I'll let you
> know how it turns out when I get a workable code loaded.
> Terry P. Gathright
>
> ----------
> > From: Bill James <w-james2@ti.com>
> > To: 669@worldnet.att.net; 'Handyboard Mailing List'
> <handyboard@media.mit.edu>; John Hatton <JohnHa@icsplc.co.uk>; 'RobotBoard
> Mailing list' <robot-board@cmf.nrl.navy.mil>
> > Subject: Re: V2X Compass
> > Date: Monday, March 02, 1998 9:15 AM
> >
> > I have a question for you, how much does the compass deviate when the • motors
> > turn on. As an ex-sailor, one of the major consideration in using • magnetic
> > compasses is deviation, and on a small bot, the deviation would vary due • to the
> > changing electromagnetic fields. So have you turned on the compass, and • watched
> > to see if the reading varyied if the motors turn on and off?
> >
> > Just wanted to know.
> > Thanks
> >
> > Bill James | work: 972.480.2306
> > Product Test Specialist | Pager: 972.597.6201
> > w-james2@ti.com
> > Precision Analog & Interface Department
> >
> > Polymath in Training | Have Spacesuit will Travel
> >
> > ------------------
> > Original text
> >
> > From: 669@worldnet.att.net, on 2/28/98 11:17 AM:
> > John,
> > My v2x has these numbers on the cpu 6448
> > PN11096
> > V2XC JJJ
> > I have a handyboard , a v2x compass and small robot platform with left • and
> > right steering motors. Everything works, I can run the motors,load
> > compass.icb and compass.c and the lcd will print the heading constantly
> > when I type v2x( ); at the command line.
> > My problem is lack of knowledge programming. I would like to know if any
> > one has a complete program that I could run and learn from.
> > Just a program that I could have my robot go one direction for a certain
> > number fo wheel rotations or length of time then turn another direction
> > ect,ect,ect. I think I could make changes rotations and directions ect. • if
> > I had a working program to start with and study.
> > Thanks
> > Terry P.Gathright
> > 669@worldnet.att.net
> >
> > ----------
> > > From: John Hatton <JohnHa@icsplc.co.uk>
> > > To: 'Handyboard Mailing List' <handyboard@media.mit.edu>; 'Robot Board • Mailing list' <robot-board@cmf.nrl.navy.mil>
> > > Subject: V2X Compass
> > > Date: Thursday, February 26, 1998 5:37 AM
> > >
> > > I have recently obtained a digital compass circuit as part of a clock
> > > (it lights an led that points north) but haven't yet tried to interface
> > > with it. I think it will be communicating via SPI but I'm not sure.
> > >
> > > The question I want to ask anybody with a V2X is what cpu does it use • on
> > > the board ?.
> > >
> > > Thank for any help.
> > >
> > > John Hatton
> > >
> > > john_hatton@bigfoot.com
>
>
--- Kent Farnsworth (akent@bga.com)
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