Re: Electronics Gurus brain required...

["andy_powell_is" <ukha@xxxxxxx>]

Dr John,

Thanks for the reply.

I wasn't thinking of using relays, from what I remember from the 
previous posts they were not required... It's probably my 
explaination that's at fault... I'll try again. (this may be totally 
incorrect - but that's why I'm asking :) 

The IR jack on the back of HV has +5v and GND 

You take the +5v from that jack and connect it to one side of the ALL 
IR emitters.. the other side of each emitter is connected to the A 
port.. ie. A1 through A8 .. this provides the GND for each emitter, 
individually controllable..

So when I want Zones 1,4 and 8 to activate I bring A1, A4, and A8 
High (or is is low) and then tell HV to send the IR signal...

The theory being because 1,4 and 8 have a complete circuit the 
emitter will fire and because the others don't they won't, hence 
giving zoned IR.

Does that make it clear what I',m thinking about? (or at least what I 
think Keith was taking about :P )

Andy

The breadboard program is Stripboard magic, I exported it as a bmp 
then modified (added the text in PSP 7)



--- In ukha_d@y..., "Dr John Tankard" <john@s...>
wrote:
> Its ok, I must have missed/forgotton about previous posts, I assume
that
> you are driving relays with port A which is switching your IR, so 
where
> you say A1, you mean the output from a relay trigerred by the open
> collector output on A1.
> 
> Just a couple of small points remember that when you select your 
relay's
> the max current sink on port a is 2W (all zones on) so dont go 
using any
> old big relays, just small ones for the job, to save connections
you
> could have revered the connections (and the diodes) and had the 
relay
> arriveing where you have the +5 and the far edges of the board 5v,
you
> would half the number of wires, as you would just be connecting a 
comman
> link across the ends.
> 
> John
> 
> PS like the breadboard programme
> 
> 
> > -----Original Message-----
> > From: andy_powell_is [mailto:ukha@b...] 
> > Sent: 26 May 2002 14:44
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] Electronics Gurus brain required...
> > 
> > 
> > Ok,
> > 
> > So Keith is busy working on KAT5 (which makes sense) so I decided
to 
> > take another look at the El Cheapo Homevision IR Zone interface
thing 
> > again to see if I could work it out...
> > 
> http://groups.yahoo.com/group/ukha_d/files/HVIR.jpg
is what I came 
up 
> with...
> 
> Could one of you electronics Gurus take a look and see if my logic
is 
> correct or if I have totally got the wrong idea...
> 
> I'm expecting 2 things to happen.. the IR emitters to - err emit 
the 
> ir and the LEDs for whichever zones to flash at the same time...
> 
> Thanks,
> 
> Andy
> 




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