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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Fri, 4 Aug 2000 08:12:21 GMT
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Viewed:
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795 times
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Mauro Vianna <mauro_vianna@hotmail.com> wrote:
> Hi, Mario. you may not remember but we exchanged e-mail before. I • questioned
> about your old style car with 2 gears, remember?
Sure, I do :-)
> Your site is great. One of my favorites. If I decide to do one to present • my
> ideas, that is one I would use as a model. I have been watching ITLUG
> challenges also. That's interesting how simple problems requires so much
> thinking, testing and improvement. Of course I got some ideas by your
> comments from the dragster races and the line following competition,
> especially the battery discussion. We are trying to organize a brazilian
> users group. ITLUG events and presentation are great.
> Yes, I know, I'm not so original. :) Unfortunatelly I did not visit both
> sites for some time so I don't know if there are any news.
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 days, including a *large* one and
another that's absolutely unconventional. But don't want to spoil the
surprise :-)
> Nice approach. It combines a nice way to measure travel distance, turn • angle
> and object detection, all in one.
> Unfortunatelly I have no rotation sensors yet. It's virtually impossible • to
> get them here in Brazil but I met a guy who did. I hope to get 2 and try
> this. I'll try this for sure as soon as I can.
They aren't available in Italy too, except in the Ultimate Accessory kit
(but who wants to buy 2 remote controls just to have 2 rotation sensors?). I
got mine from S@H through a US friend. I'm sure one of the american guys who
follow this ng will be glad to help you in getting them if you ask for it,
there are so many kind people.
> The only disadvantage is that all 3 ports are used so there is no room for • a
> touch sensor, unless you combine it with the light sensor for additional
> functions.
True.
> 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.
> 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). 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.
Ciao
Mario
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Message has 1 Reply:
 | | Re: Autonomous Robot
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| (...) a (...) the (...) reads (...) 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... (...) that. (...) (24 years ago, 6-Aug-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Autonomous Robot
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| "Mario Ferrari" <mario.ferrari@edis.it> wrote in message news:Fyo60o.6LF@lugnet.com... (...) the (...) about your old style car with 2 gears, remember? Your site is great. One of my favorites. If I decide to do one to present my ideas, that is one (...) (24 years ago, 4-Aug-00, to lugnet.robotics)
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