Subject:
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Re: Make a goal by the IR port on RCX
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 16 Feb 2001 11:15:31 GMT
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Original-From:
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Yiu <h9819152@(stopspammers)hkusua.hku.hk>
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Viewed:
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832 times
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Thanks for all of the suggestions from all of you.
As the 3 input port had been occupied by 3 analog sensors
(not light sensor, but declear as light sensor in program),
so I do not think overloading a sensor is a good idea.
The suggestion of communicate with a computer or RCX worth a try.
(sadly, I do not have 2 RCX)
Beside receiving message signal, is it possible to read a raw reading from
the IR port of RCX?
(Say, by the use of legOS)
Thanks again
YY
Matthias Jetleb wrote:
> A simple on/off sensor can be placed in series or parallel with other
> on/off sensors however analog sensors cannot. It should be pointed out
> that if you do group sensors, it becomes impossible to determine which
> one was actually triggered. This could be disasterous depending on the
> application.
>
> A real nice advantage to using the IR port as a sensor is that you
> gain the potential for partial immunity to background light. A
> standard light sensor will respond to light sources regardless of
> their origin, hence a robot that moves past a window might think it
> hit an object just because it's in sunlight. The IR port allows you to
> avoid this problem somewhat by reading back the data that is sent out.
> If you continuously transmit 111011001000 and all you read back are
> 000000000000 then you know you aren't near an object. If all you get
> back is 111111111111 then you know you're in front of a light source
> and can probably proceed with caution. If you get back a 100111010100
> (or whatever) then you've encountered another robot that is also using
> the IR port as a sensor, but it's code is different (and it is
> therefore possible to identify it), but if you get back your original
> 111011001000 then you know it's a valid reflection of your own signal
> and there really is an object ahead.
>
> Matthias Jetleb
> VA3-MWJ
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Message is in Reply To:
 | | Re: Make a goal by the IR port on RCX
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| A simple on/off sensor can be placed in series or parallel with other on/off sensors however analog sensors cannot. It should be pointed out that if you do group sensors, it becomes impossible to determine which one was actually triggered. This (...) (24 years ago, 16-Feb-01, to lugnet.robotics)
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