Subject:
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Re: Using the IR Port to simultaneously send and receive for proximity sensing
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 16 Apr 1999 09:57:46 GMT
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Viewed:
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1143 times
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Peter Hesketh <pbh@phesk.demon.co.uk> wrote:
> In article <01BE8785.9B90A2A0.david.cuthill@home.com>, David Cuthill
> <david.cuthill@home.com> writes
> > I haven't really looked into this but can the IR port on the RCX be used to
> > send out a message and then flip to receive the reflected infrared light
> > thereby using it as a sensor and still have 3 ports left for other sensors?
>
> Unfortunately the speed of light is *** to fast.
In fact, the IR emitters and IR receiver are in such close proximity that
the receiver already receives whatever the emitters emit, using a direct
path. The RCX ROM ignores messages it sends out and is thereby able to
avoid getting lost in the confusion.
But yes, the speed of light is too fast and the speed of the RCX MCU is so
slow that if you are trying to do any sort of time-of-flight measurement,
you would be out of luck there, even if you could block the path between
the emitters and the receiver.
-Kekoa
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