Subject:
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Re: detecting goal objects at a distance
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 3 Jan 2000 10:07:16 GMT
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Viewed:
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1445 times
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Thanks a lot Ben!
I'm going to look for some of those IR LEDs and make some experiments.
Mario
Web page: http://www.geocities.com/~marioferrari
LUGNET member page: http://www.lugnet.com/people/members/?m=22
Proud member of ItLUG: http://www.itlug.org
Ben Jackson <ben@ben.com> wrote:
> In lugnet.robotics, Uwe Denzer writes:
> > Mario Ferrari wrote:
> >
> > > Does any of you have suggestion on what kind of IR led is more • appropriate
>
> 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 seems to be an LED behind a lens, rather than embedded in • a
> diffusing material). I chose it because it claimed to be a 3v part, which • made
> battery selection easier. I'm going to exchange it for one of the 5-6v • LEDs
> with a standard diffuse plastic body.
>
> To power it I got 3v lithium watch batteries (biggest I could find, about • the
> size of a quarter). If I go with 6v LEDs I'll need two of them sandwiched
> together. I plan to use 1/2" heat-shrink tubing to hold the batteries • together
> with electrodes (aka wires soldered to a loop of large gauge copper wire).
>
> > > to make such an object? Do I need any additional circuit, or just a LED • and
> > > a battery (and the proper resistor) are enough?
>
> They make some LEDs with builtin resistors now. You should make sure you • know
> what kind you've got.
>
> > I imagine that - even if using such an IR LED as a beacon - roomlight • etc.
> will
> > still be the major problem.
>
> The LEGO sensor is far more sensitive to IR already, even without a • filter.
> That's why I was choosing it (although being invisibile to humans is a • nice
> side-effect).
>
> > So, I'm pretty sure that a quite simple means at the detector side would
> > simplify such a project dramatically: an optical IR filter.
>
> You can get these (as well as so-called Hot Mirror filters to block IR) at • any
> camera store.
>
> --Ben
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Message has 1 Reply:
 | | 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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Message is in Reply To:
| | 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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