Subject:
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Re: Autonomous Robot
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 2 Aug 2000 20:44:51 GMT
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Original-From:
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Andy Gombos <gombos_2000@yahoo.%nospam%com>
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Viewed:
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1515 times
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For mapping, you can use an ultrasonic sensor, like the one designed by John
Barnes. This can find open areas up to 2 meters/yards away. Storing only object
locations is best, IMO, because it uses the least space (there were posts on
this before..). Then you can just see if your current path intersects any of the
known obstacles.
Andy
P.S. I would love to help you. I have been trying to do something like this for
as long as Mindstorms has been out. You brought some new ideas to my project.
Mauro Vianna wrote:
> Jason,
>
> Of course a second brain will help!
>
> Everything is in my mind yet and lots of issues are not solved. I hope this
> post generates interesting discussions on how to solve them. As I said I
> will test these approachs in a slow pace, most because of my lack of time
> than my will. I want to post all interesting features I achieve (maybe even
> a simple site later?).
>
> Although the project may seen a complex one, I want to test a lot of smaller
> tasks at a time, so that I can join them later as a bigger problem. For
> example, I have tested the following features until now:
>
> 1) A sonar-like feature using the RCX IR emiiter and a light sensor to
> detect IR reflections. It was described in this list earlier (not by me). It
> worked fine but wasted batteries fast. Some people gave me a few tips to
> save them, but I did not test yet.
>
> 2) An algoritm to use light detection as a compass. The basic idea is that
> my window is the brighter light in the room (it only works during the day)
> so if you detect the brighter light source you can find a direction without
> a compass. Not my idea really. See the Ants project at MIT site. The author
> copied it from real ants too! Sorry, I lost the URL. :(
> It's not precise and depends a lot of the environment but it worked well in
> my apartment since all windows are on the same direction.
>
> Unfortunatelly I don't know LegOS and in fact I don't want to learn it right
> now. I know the language is powerful is good but don't have the time now. I
> mentioned both LegOS and QC since those don't have the same memory
> limitations of the original firmware.
>
> NQC is bound to the firmware variable limit, so map representation is not
> possible unless it is hard coded. One workaround I thought about was to use
> a simple NQC program that explores the environment and send information to
> the datalog. Then it returns to a location where the IR tower can reach it.
> A more complex Visual Basic program could process the datalog and create a
> NQC code to represent the map from the datalog info and download the new
> program with the hard-coded map. The idea itself is simple. The main problem
> would be the lack of precision of the explorer info. RCX doesn't have GPS,
> compass, etc. so obstacle location would not be real precise.
> Of course, we can simplify the problem. In fact I don't need to know where
> the obstacle is, but where it isn't. Once a path is found (e.g. straight
> movement for 2 meters without obstacle), we can store only this information.
> A simpler map algoritm could be used. David Leper used a similar one in his
> site: http://www.geocities.com/Colosseum/Dome/5088/Hand.htm (This is not the
> root!)
>
> Mauro
>
> "Jason" <jasonrowoldt@yahoo.com> wrote in message
> news:FyMqs8.9Bx@lugnet.com...
> > In lugnet.robotics, Mauro Vianna writes:
> > > I had an idea to a project that I want to start in a very slow pace. In
> > > fact, it is based in lots of ideas already presented here in this list so • I
> > > am not sure if someone already tried it before. Any help is welcome.
> > > The main goal is to build a Lego robot able to navigate inside my home
> > > without assistance. Although it is simple, it involves a lot of issues, • some
> > > of then already discussed here. The main approach follows:
> >
> >
> > <snip a really interesting concept>
> >
> > Wow, I would love to see documentation of the process you go through here.
> > Alone you might get discouraged with so complex a task. I got the • Mindstorms
> > 1.0 a few months ago but have yet to really fool with it.
> >
> > This may be what jumpstarts my activity.
> >
> > Let me catch up with you, especially with LegOS, and I'll be a second • brain for
> > this project if you'd like.
> >
> > Jason
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Message has 1 Reply:
 | | Re: Autonomous Robot
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| "Andy Gombos" <lego-robotics@crynwr.com> wrote in message news:39888843.D78EFA...hoo.com... (...) John (...) I saw a sensor like that in Michael Gasperi site ((URL) Maybe it's the same one. I am trying to use Lego pieces only. Don't understand me (...) (25 years ago, 4-Aug-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Autonomous Robot
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| Jason, Of course a second brain will help! Everything is in my mind yet and lots of issues are not solved. I hope this post generates interesting discussions on how to solve them. As I said I will test these approachs in a slow pace, most because of (...) (25 years ago, 2-Aug-00, to lugnet.robotics)
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