Re: ir transmitter some success

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

Hi Des
            Sounds
like you need the intelligent version that Ian B is
working on .I initially used the 16f876 a 28 pinner and then upgrade to
the
16f877 the 40 pinner . As i mentioned to Ian B , about an earlier post
from
Dave Mc Laughlin about  Can Bus system ,were the pic passes the
message to
the can bus chip which passes it to the bus ,its a multi master system
in
which the unit with the highest priority message gets the bus . Sounds
like
the way to go .

Frank Mc
----- Original Message -----
From: "Des Gibbons" <des@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, June 02, 2002 8:16 PM
Subject: RE: [ukha_d] ir transmitter some success


> Hi Frank,
>
> The 1 rx active probably would be a problem to be honest. It would
be
> possible in my scenario to have simultaneous IR tx and I don't really
want
> to have collisions or missed signals :/
>
> What PIC are you using for the IR decode btw? 16f628?
>
> Cheers, Des.
>
> ( Learning more about electronics than I ever wanted to ;))
>
> > -----Original Message-----
> > From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> > Sent: 02 June 2002 19:01
> > To: ukha_d@xxxxxxx
> > 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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