RE: Homevision - one more time...

["Phil Harris" <phillip.harris1@xxxxxxx>]

I'll actually be seeing Ian this weekend so that's one of the things that
we
can discuss but unfortunately stuff like that gets forgotten as we usually
seem to end up going off at a tangent on something else ... last weekend I
popped over to see him and we somehow ended up dismantling a couple of
light
level sensor PCBs!

Basically it should just be a case of wiring up multiple emitters to one of
his PCBs as I think they're meaty enough to supply the juice for the job.

Phil

> -----Original Message-----
> From: James Hoye [mailto:james.hoye@xxxxxxx]
> Sent: 10 May 2001 22:01
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Homevision - one more time...
>
>
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> ---------------------------------------------------------------
> > It's not a case of running *ONE* emitter but several ... not
> zoned ... but
> > just say one attached to each piece of kit rather than a single
> > emitter. Can
> > HV power multiple IR emitters directly or do you need to run an
IR
> > distribution amp? To clarify things I wanted to strap emitters to
> > my IR543,
> > my VCR, DVD, LD, video scaler, projector and amplifier which is
seven
> > emitters but I never knew whether the HV could drive seven (all
with the
> > same signal, not zoned) on it's own.
>
> Depends on how much current HV can sink on the IR outputs.  The led
that I
> used is rated 100mA continuous, but since it is likely to be in
> *very* close
> proximity to the device being controlled, I guess 50mA would
> easily suffice,
> probably even 20mA.  Driving 7 leds, HV would therefore need to be
able to
> sink around 300mA.  Suitable forward current limiting resistors
> can be used
> to limit the current used, probably 500R.
>
> > Now I just need to rig up a multi channel IR sender with a
> single receiver
> > ... which I also don't quite know how to implement but I know
> that the IR
> > receivers on LetsAutomate are *HORRENDOUSLY* expensive! (I think
> > this is one
> > for Ian Birds IR PCBs!)
>
> I think this one's pretty easy - hey Ian?  Simply a few resistors with
a
> transistor or two.  Of course, it would need its own power as we are
> assuming here that HV's outputs cannot provide adequate current.
>
> James H
>
>
>
>
>
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