Subject:
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Re: Even better, RIS 1.5, $99.99
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 9 Jun 2002 05:49:44 GMT
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Original-From:
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Steve Baker <sjbaker1@airmail.(AntiSpam)net>
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Reply-To:
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SJBAKER1@AIRMAIL.antispamNET
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Viewed:
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842 times
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Mike Payson wrote:
> I've been wondering if anybody has any ideas why they chose to go with IR as
> opposed to RF?
Probably regulatory. Lego want to market this in many countries - and probably
don't want to redesign and re-certify it in every market.
The 27MHz band is widely used for toys - but you get a lot of radio interference
from toys, CB radio's and all the other junk on that band. That might not matter
for an RC Car where a 1 millisecond glitch would go unnoticed - but when you
are transferring digital data you could get in trouble.
Almost all of other radio control model channels either need certification
in many countries - or the freely available band is different in different
countries - or you are restricted from using it for data comms.
The 'obvious' standard now would probably be BlueTooth - but I don't think
that was stable or cheap when RIS was being developed.
> The substantial limitations of IR make it highly impracticle
> for robotics. The only two reasons I can see would be cost or power
> limitations. I can't imagine that RF would cost much more then IR (but I
> could be wrong), so I'm assuming it is a power issue.
I doubt it's power...cell phones and 27MHz kids toys seem to run for ages on
their batteries.
----------------------------- Steve Baker -------------------------------
Mail : <sjbaker1@airmail.net> WorkMail: <sjbaker@link.com>
URLs : http://www.sjbaker.org
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Message is in Reply To:
 | | Re: Even better, RIS 1.5, $99.99
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| I've been wondering if anybody has any ideas why they chose to go with IR as opposed to RF? The substantial limitations of IR make it highly impracticle for robotics. The only two reasons I can see would be cost or power limitations. I can't imagine (...) (22 years ago, 10-Jun-02, to lugnet.robotics)
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