Re: ir transmitter some success

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

Sorry Des
               
You would need 1 more port pin to detect rx active.
Frank Mc
----- Original Message -----
From: "Frank Mc Alinden" <armagh@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, June 02, 2002 5:00 PM
Subject: Re: [ukha_d] ir transmitter some success


> 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
> > > >
> > > >
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