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I want to make a robot that finds a small object, picks it up, and carries it somewhere. I don't want to have to tell the robot how to find it (eg with a line on the floor), and I'd prefer to avoid randomly (or even systematically) searching the (...) (25 years ago, 30-Dec-99, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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(...) it (...) a (...) systematically) (...) darkened (...) barely (...) target in (...) on (...) make (...) This is a thing I'm interested in too. Those of you who were at the mindfest might remember the soccer playing robots. The bots were really (...) (25 years ago, 30-Dec-99, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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(...) I imagine that - even if using such an IR LED as a beacon - roomlight etc. will still be the major problem. So, I'm pretty sure that a quite simple means at the detector side would simplify such a project dramatically: an optical IR filter. (...) (25 years ago, 31-Dec-99, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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Ben Jackson <ben@ben.com> wrote in message news:FnJpCI.JGo@lugnet.com... (...) it (...) a (...) systematically) (...) darkened (...) barely (...) target in (...) on (...) make (...) Consider blocking the light emitter on the sensor, either (...) (25 years ago, 31-Dec-99, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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(...) Well, I do now! I bought three last night. I got a GaAs IR LED that was clearly made for a remote control application. The good news is that when it is pointed at the LEGO light sensor it pegs at 100%! Unfortunately it's higly directional (it (...) (25 years ago, 31-Dec-99, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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(...) Well, I knew that camera stores sell IR blocking filters but IR transmission filters? Are you sure? (What would be the purpose for normal photography?) Uwe (25 years ago, 1-Jan-00, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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(...) IR Photography, of course. Lookup Kodak HIE, for example. The filters you are looking for are Wratten #87 and 87C. If you look at them they appear to be black because they pass no visible light. I believe the difference between the two is (...) (25 years ago, 1-Jan-00, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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(...) I've read this tip several times. I experimented with it last night, and the difference between blocking and not blocking the sensor was minimal. My light sensor must not bleed much light directly across. Perhaps I'm doing something wrong? Re: (...) (25 years ago, 1-Jan-00, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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(...) OK, thanks for the info. That's interesting. I'll look for it. Uwe (25 years ago, 1-Jan-00, to lugnet.robotics)
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| | Re: detecting goal objects at a distance
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Thanks a lot Ben! I'm going to look for some of those IR LEDs and make some experiments. Mario (...) appropriate (...) it (...) higly (...) a (...) made (...) LEDs (...) the (...) together (...) and (...) know (...) etc. (...) filter. (...) nice (...) (25 years ago, 3-Jan-00, to lugnet.robotics)
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| | RCX Web Server
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I've been working on a RCX web server, and it seems my project is almost done. When I finish it, the website running off of the RCX will be available at (URL) Its not up yet, but it will be (...) (25 years ago, 3-Jan-00, to lugnet.robotics)
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