AC or DC?  I have a few links to start out:

1-wire controllers:
http://www.aagelectronica.com/aag/en-us/dept_2.html
http://www.aagelectronica.com/aag/index.html (front page)

Digikey only seemed to have this 24V output module, in black or red:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=9085&Row=511138&Site=US
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=9085&Row=510961&Site=US
I did find some sealed solid-state 24V relays there:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=10099&Row=627139&Site=US
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=10099&Row=627300&Site=US
and an hermetically sealed model which is much more expensive:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail?Ref=12192&Row=626000&Site=US

Perhaps my most interesting find:
http://www.cnc4pc.com/DC_Relay_Board.htm

Hope I'm not too far off-base here :)

   Ben




On 4/10/06, Allen Brown <[EMAIL PROTECTED] > wrote:
At least for this year 8 should do.  In my wildest dreams
I can't imagine using more than 16.  But I would be happy
with 8.
--
Allen Brown  [EMAIL PROTECTED]  http://www.peak.org/~abrown/
   The first rule of intelligent tinkering is to keep all the pieces.
     --- Aldo Leopold

Ben Barrett wrote:
> How many relays do you need?  (How many distinct outputs/valves
> to control?)
>
>    Ben
>
>
> On 4/10/06, Allen Brown < [EMAIL PROTECTED]> wrote:
>
>>I want to set up a small computer (Linux of course) to
>>control the valves for watering my lawn.  I'm thinking
>>of using the TS7200 as the computer.
>>http://www.embeddedarm.com/epc/prod_SBC.htm
>>
>>That gets me a bunch of parallel outputs.  Good for
>>controlling valves.  But I need to control 24V.  To
>>satisfy Corvallis that it is safe, the most straightforward
>>is to use relays between the computer and the valves.
>>
>>Do you know of a suitable relay board?
>>Input control: 3V-5V
>>Output control: 24V @ 1A or more
>>--
>>Allen Brown  [EMAIL PROTECTED]  http://www.peak.org/~abrown/
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