Subject:
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Re: Compass or Gyro
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 19 Jun 2002 22:19:52 GMT
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Viewed:
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616 times
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DerekRiley <rileyd@wartburg.edu> wrote:
> I am building a six legged robot to emulate an ant, and I need a good way to
> tell what direction it is facing. I am using a Handy Board with an
> extension board, and I don't want to spend too much. I have looked at
> compasses and gyros, but I am not sure what will work best for me. Thanks
Derek,
what you need to assess is how stable you need a reading (I guess you
want an heading). A compass needs a stable platform to provide you with a
decent value. Any acceleration (turning is a kind of acceleration) is going
to spoil you values. A gyro on the other end (3 degrees of freedom) is going
to provide you with a stable reading, but since its orientation is fixed
in space and earth rotates, you need to correct it every once in a while (10
minutes is a good reference for degree accuracy). This correction can be
done manually (you use a compass and line up the gyroscope reference axis)
or automatically via a flux valve sensing the earth magnetic field and
applying appropriate corrections to the Gyroscope.
There are two ways to power a gyro: electrical and pneumatic.
With the electric system you have a motor that makes the Gyro rotor
spin at speeds in the order of tens of thousands RPM. With the pneumatic
system the same is achieved by a turbine.
I have no idea what you want to achieve and it might be better to
describe the problem to get a better suited solution.
Cheers
--
__|__ Fabio Sardone|
____(0)_____ | http://www.geocities.com/f_sardone/pictures.html
O o O | Change dot in . and remove .invalid
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Message has 1 Reply:
 | | Re: Compass or Gyro
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| About the most economical way to install a compass is the Dinsmore analog unit. It has two analog outputs which you will need to do some serious processing on, they aren't sin and cos, so you have to do a sort of arctan and then lookup table (...) (22 years ago, 19-Jun-02, to lugnet.robotics)
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Message is in Reply To:
| | Compass or Gyro
|
| I am building a six legged robot to emulate an ant, and I need a good way to tell what direction it is facing. I am using a Handy Board with an extension board, and I don't want to spend too much. I have looked at compasses and gyros, but I am not (...) (22 years ago, 15-Jun-02, to lugnet.robotics)
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