RE: Electronics Gurus brain required...

["Dr John Tankard" <john@xxxxxxx>]

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@xxxxxxx] 
> 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



For more information: http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx 
Subscribe:  ukha_d-subscribe@xxxxxxx 
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx 
List owner:  ukha_d-owner@xxxxxxx 

Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/




For more information: http://www.automatedhome.co.uk
Post message: ukha_d@xxxxxxx 
Subscribe:  ukha_d-subscribe@xxxxxxx 
Unsubscribe:  ukha_d-unsubscribe@xxxxxxx 
List owner:  ukha_d-owner@xxxxxxx

Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.