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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Sun, 6 Aug 2000 00:02:33 GMT
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Viewed:
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1236 times
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> > Although the idea of vertical and horizontal lines seens good, I still
> > didn't figure out a good algoritm to deal with that. The light sensor
> > measures a mean light reflection. That means that if it over the edge of • a
> > black light and a white paper, the reading could be the same as the one • from
> > a gray line. I confess I still didn't try that. Sometimes you must see • the
> > robot working to figure out a solution...
>
> You could measure transitions instead of single values. Sampling some • reads
> at a specified time interval should help you to recognize the situation.
Sorry, Mario, I still didn't figure out your proposal. Could you explain
that better? Did you (or anybody else?) already did that? Maybe if I can
understand better looking at the code, if available...
> > I already got a lsaer pointer but i never figure out what to do with • that.
> > I bought a book ("Mobile Robots") that mentions a comercial robotic • vacuum
> > cleaner that uses a similar approach. He also have a rotating laser • pointer
> > but also have a rotating ligt sensor. In his case the stations are • passive
> > and and are designed to reflect the light back. these reflections are a • kind
> > of bar code to identify the stations. I liked the idea but didn't figure • out
> > how to do that yet.
> > Your idea is good also. The problem is the number of RCX needed. Line of
> > vision is a problem also, but could be dealt with.
>
> I love your idea of using bike-style reflectors and making the stations
> purely passive (in another post of yours).
In fact the idea is not mine. :) I read in previous post!
> After all you already have an
> idea of which station you are going to hit with the laser beam (from
> odometry) so you don't need to identify it. Coupling the laser beam to a
> light sensor should allow you to detect the reflected beam. As soon as I • get
> back from my holidays I'll do some test.
That would be great. In fact I have more ideas than time to test them. :)
Happy holday!
Mauro
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Message has 6 Replies:
 | | Re: Autonomous Robot
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| (...) still (...) of (...) one (...) It's true that when you're on the border of the tape your light sensor reads an average value, but if you continue in the same direction you will finally get into the middle of the tape and supposing the tape is (...) (25 years ago, 6-Aug-00, to lugnet.robotics)
| | | Re: Autonomous Robot
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| in article 398D9DA5.300D416C@airmail.net, Steve Baker at lego-robotics@crynwr.com wrote on 8/6/00 10:17 AM: (...) <regretfully snipped excellent discussion of using line following to find bar codes for landmark recognition> It would be nifty if you (...) (25 years ago, 8-Aug-00, to lugnet.robotics)
| | | Re: Autonomous Robot
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| in article FyyAqy.5zy@lugnet.com, Ian Warfield at ipw47@hotmail.com wrote on 8/7/00 6:56 PM: (...) That's what this is all about, after all. Type on! (...) There are two ways to design a laser sensor - directional or omnidirectional. Either way (...) (25 years ago, 9-Aug-00, to lugnet.robotics)
| | | Re: Autonomous Robot
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| in article 398F84B6.F9AE89A8@airmail.net, Steve Baker at lego-robotics@crynwr.com wrote on 8/7/00 8:55 PM: (...) Of course, if odometry puts you inside the circle, you don't need bar codes because you already know where you are! (...) True, and I (...) (25 years ago, 9-Aug-00, to lugnet.robotics)
| | | Re: Autonomous Robot
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| in article 3991FAAF.A8D0FDBA@airmail.net, Steve Baker at lego-robotics@crynwr.com wrote on 8/9/00 5:43 PM: (...) <snip> (...) You can handle this two ways. 1) omnidirectional laser sensor with cylindrical cross-section, which always has the same (...) (25 years ago, 10-Aug-00, to lugnet.robotics)
| | | Re: Autonomous Robot
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| in article 399399F2.ADECFC6D@airmail.net, Steve Baker at lego-robotics@crynwr.com wrote on 8/10/00 11:15 PM: (...) That's the sort of thing I've been imagining. JP Brown's Laser Target invention (URL) be generalized up to something involving a paper (...) (25 years ago, 11-Aug-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Autonomous Robot
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| (...) questioned (...) Sure, I do :-) (...) my (...) Many thanks for your kind words about my and ItLUG sites. I'm happy you like them. I have recently slightly rearranged my site to make navigation easier. I'm going to post some new robots in a few (...) (25 years ago, 4-Aug-00, to lugnet.robotics)
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