Re: ir transmitter some success

["Frank Mc Alinden" <armagh@xxxxxxx>]

Hi Des
            Just a
little background on my homrbrew ir system . I have an 8
zone tx circuit (only 3 being used) . I have recievers in each room ( 3
off)
on the board with the reciever i have a chip which i use as a pulse
extender
and a +5v reg . The recievers are wired in 4 core security cable.
red +12V
black ov
white signal
blue  extended pulse (mono stable)
I have a rx multiplexer using another 4051 (which i also  use for the
tx
multiplexer) which all the rx extended pulse (blue wire) are connected
to.
all my rx signal wires (white) go to individual opto isolators with all
output side of optos joined together then to my pic rbo input .
When my pic detects an ir signal on rb0 it decodes the signal. I can
then
scan the input mux and detect which rx is active and act upon it . The
pulse
extenders give the pic some breathing space . I use the same 3 mux pins
for
both tx and rx as i am not concerned about  doing both at exactly the
same
time . One down side is that only 1 rx can be active at any time as all
rx
unit signals are paralled on the output side.
Sorry for babbling on ,i cant see why you couldnt use the same similar
setup unless the only 1 rx active is a .real problem
    You would require 3 pins for mux  i tx and 1 for
rx.

Frank Mc
HTH

----- Original Message -----
From: "Des Gibbons" <des@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, June 02, 2002 4:37 PM
Subject: RE: [ukha_d] ir transmitter some success


> Frank,
>
>
> OK, just to really make things complicated ;)
>
> Would it be possible, you're gonna love this, to reverse the whole
concept
> and use it for zoned IR input :) obviously each zone would need a TSOP
or
> similar, but is there a simple way of using trannies to indicate
which
zone
> is active and send the data on its way. Collisions seem to be the
biggest
> stumbling block to me :/
>
> Obviously the LPT port would have to be bi-directional.
>
> /me scurries off to see how many pins are available on an LPT port
;)
>
> Cheers, Des.
>
> > -----Original Message-----
> > From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> > Sent: 02 June 2002 18:23
> > To: ukha_d@xxxxxxx
> > Subject: Re: [ukha_d] ir transmitter some success
> >
> >
> > Now thats Better Des
>
>                                 
I cant see why not . So long as you
dont
> > change the state of the  lpt  port  pins that are
being used for the
> > multiplexer while transmitting just the tx pin . Pin 4 which
> > enables the 555
> > i would opto isolate from the printer port.
> >
> > Frank Mc
> > ----- Original Message -----
> > From: "Des Gibbons" <des@xxxxxxx>
> > To: <ukha_d@xxxxxxx>
> > Sent: Sunday, June 02, 2002 3:51 PM
> > Subject: RE: [ukha_d] ir transmitter some success
> >
> >
> > >
> > >
> > > >
> > > > Sorry Des
> > >
>                
I just assumed serial . That shouldnt be a problem
> > > > ,selecting zones . I assume some other device is
generating
> > the ir 38khz
> > > > carrier?
> > > >
> > >
> > >
> > > errr, the LPT port :)
> > >
> > > http://www.czechin.com/minidisc/gener.gif
> > >
> > > Now, can they both be on the same LPT port is the question
:)
> > >
> > > Des
> > >
> > >
> > > For more information: http://www.automatedhome.co.uk
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> >
> >
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