Don Foreman wrote:
On Sun, 3 Jan 2010 09:29:58 -0500, "Karl Townsend"
wrote:

My winter project is a microcontroller to ventilate and water my
greenhouse/high tunnel. Parallax has a sale on controllers with free
shipping through tomorrow. I plan on using Opto 22 boards and IO blocks for
this project. Parallax makes a module just for this:
http://www.parallax.com/StoreSearchR...9/Default.aspx

(parallax part number 27945 if link above breaks)

I did a count this morning and this is no where near enough IO. Parallax
makes a 40 pin stamp with 32 IO that would work. But they don't make the
above module for it. I don't want to paint myself into a corner. Should I
look at building a custom 27945 module for the 40 pin stamp? (I don't
normally do this kind of work) Or is it no big deal to use two stamps and
link them to communicate? Other ideas?

Karl

If you're comfortable that the 40-pin stamp would meet all other
criteria, namely has enough I/O and you feel able to program it in
BASIC, I wouldn't worry about the module. We can cook up an
interface between stamp I/O and opto-22.



Nothing to that...

http://www.opto22.com/site/solidstaterelays.aspx

120 volt 10 amp - $14
http://www.opto22.com/site/pr_detail...=4&item=120A10



--

Richard Lamb
http://www.home.earthlink.net/~cavelamb/


"The clock of life is wound but once, and no man has the power
to tell just when the hands will stop, at late or early hour...
Now is the only time you own. Live, love, toil with a will.
Place no faith in time. For the clock may soon be still."