piclist 2002\10\14\130306a >
Thread: IR remote control...
www.piclist.com/techref/io/irs.htm?key=ir
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face BY : Wagner Lipnharski email (remove spam text)



Robert E. Griffith wrote:
> This was alluded to by others, but to put it in simple terms... If
> you are not constantly sending IR data to the models, (bandwidth is
> not tight), but rather are sending short commands every once in a
> while (like turn, stop, go, etc...), then you can just include a
> device address with each IR command.  All receivers listen to every
> command, but respond only to the ones with the address set to their
> own address.  If two transmitters transmit a command at the same
> time, they will interfere with each other and neither will be
> received.  The operator would just resend the command.
>
> Most consumer IR protocols dedicate some bits to identify the device
> so that, for example, your DVD remote does not control your VCR.
>
> --BobG

... except if transmitter A starts to send the packet, receiver A decodes
its own address and starts to receive. In middle of the A data frame,
transmitter B starts to transmit and garble all A reception...

TXA AAAAAAAAAAAAA------
TXB ------BBBBBBBBBBBBB

RXA AAAAAAXXXXXXXXXXXXX
RXB -------------------

There is a simple (?) way, collision detection, a transmitter can only
start to send IR if there is no IR being transmitted.  Even so, there is a
chance of collision, it is not that difficult two operators press the key
within milliseconds.

VV46NER

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