Subject:
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Re: A robot who knows his position (fwd)
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 30 Apr 1999 15:09:32 GMT
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Original-From:
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Ralph M. Deal <deal@kzoo%AvoidSpam%.edu>
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Viewed:
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887 times
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On Fri, 30 Apr 1999, Mike Moran wrote:
. . .
> Now I come to think of it, if you allowed the light sensor to move such that
> it could follow the head of the arrow, then we could arrange it so that the
> light sensor starts off above the bright arrow. However, when the arrow moves
> as a result of movement then the light sensor assembly starts "seeking" right
> and left until it encounters the bright arrow again. Since the assembly knows
> how far it has travelled, and in what direction, it can give a reading on
> bearing. Unfortunately this would require use of a motor and some fidgeting
> around with some code to drive the thing. However, it sounds like it may be
> do-able and useful.
> Can anyone see any problems with this?
Yes. It is unnecessarily clumsy and heavy and would require considerable
computer attention to track rotation successfully. I believe digital
encoding would be better. Anyone know how one determines direction
in instruments such as electronic surveying instruments? If the sensor is
only one bit intensity sensitive (on/off), then two sensors placed so that
one is 90 degrees out of phase with the other will allow direction
determination since the pattern would be
#1on,#2on,blank,blank,#1on,#2on,... in one direction and the same but with
#'s 1 & 2 two reversed in the other direction. The system would surely be
messed up with any rotation too rapid for the reponse time of the
sensors/computer processing time.
Looking forward to resolution of this problem and even a working
implementation! Ralph deal@kzoo.edu
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: A robot who knows his position (fwd)
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| (...) moves (...) right (...) knows (...) That sounds like a challenge to me! ;-) I may just try and build something to prove it can be done or can't be done easily. I believe the attention required from the computer could be minimal. A first go at (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: A robot who knows his position (fwd)
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| (...) around (...) disk (...) for (...) Well, I was just going to place the light sensor statically relative to the case of the compass, and overhead. It would simple note whenever the head of the arrow went past. This is pretty useless, which is (...) (25 years ago, 30-Apr-99, to lugnet.robotics)
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