Subject:
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Re: some more questions about lnp.
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sat, 28 Sep 2002 17:45:04 GMT
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Viewed:
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2828 times
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The frequency of the RCX's IR does not change at all:
"
The RCX uses a 38kHz carrier, which is pretty typical for TV remotes. As for
the sampling rate, the RCX runs at 2400 bps, which makes each bit approx 417us
"
http://www.crynwr.com/lego-robotics/
I think the only way you could have them send and receive at the same time,
is somehow have them set to two different frequencies.
If you had the RCX listen at the same time that you are sending, you will
receive the data you are sending.
Tim
In lugnet.robotics.rcx.legos, Kenneth Johansen writes:
> duh... guess i was kinda wrong here.. IR is in reality a frequency defined
> from A to B.
> any messages sent within this spectre is said to be IR messages. so in
> theory sending an IR message closer to A than B from one RCX.
> and at the same time sending an IR message closer to B than A from the
> other RCX, should make it possible to send and receive at
> both RCX at the same time.. only question now is, what frequency does the
> RCX and IR tower use!?
>
> unfortunately i have a sneaking suspicion that they all use the same
> frequency which makes my point below still valid.
>
> oh well..guess im just rambling here.
>
> regards
> kenneth
> kennethj@stud.cs.uit.no
>
> kenneth johansen wrote:
>
> > ok, im back again with even more questions.
> > when i created my last program using lnp on an RCX i did a mistake by
> > setting the same port as the one im listening on and the one im sending
> > on.
> > this made me think. what is the reason we use two different ports to
> > listen for, and send, messages?
> > i mean, you are either sending or receiving. IR by its nature (as i
> > understand it), is a broadcast medium and if one RCX sends at the same
> > time
> > as another RCX tries to send, the resulting IR that may, or may not, get
> > to the other RCX will most likely be garbled. thus an RCX cannot
> > be sending and receiving an IR message at the same time!
> > By this errr....theorem(?) i conclude that only one port is needed to
> > send and receive.
> >
> > soo..hmm...any comments ?
> >
> > regards
> > kennethj
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Message is in Reply To:
 | | Re: some more questions about lnp.
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| duh... guess i was kinda wrong here.. IR is in reality a frequency defined from A to B. any messages sent within this spectre is said to be IR messages. so in theory sending an IR message closer to A than B from one RCX. and at the same time sending (...) (22 years ago, 28-Sep-02, to lugnet.robotics.rcx.legos)
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