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Posted by Rod Speed on July 5, 2007, 10:27 pm
 


outside that a fan could

Makes more sense to only do that when the room temp isnt ideal
and doing that will help to get it closer to what is ideal etc.


actual temperatures.

In practice its better driven by the temp required etc.


logic. I could expand or

Just do it.


Use an obsolete PC and onewire kits.



Posted by Steve on July 5, 2007, 11:33 pm
 

Possible solutions have a great deal to do with "know-how".

Personally I would look into one of the inexpesnive low power single chip
microcontrollers.

For example the ET-AVR Stamp module:
http://www.futurlec.com/ET-AVR_Stamp.shtml
has eight(8) 10 bit A/D converters that can be used for measuring
temperatures as well as a bunch of I/O for turning things on and off.  There
are less expensive controllers but this is the least expensive pre-packaged
solution I've seen.

The catch is that you have to do all of the programming yourself.  If you're
into this sort of thing it's not a problem.  Tools for programming in Ada
and C are can be downloaded for free.

Using this approach you can minimize the amount of power used to control the
system.  Using an old PC to serve the same function would work, but consume
a signficantly greater amount of power.

Regards,
Steve
(The Duck)



Posted by Morris Dovey on July 5, 2007, 11:42 pm
 Steve wrote:

| For example the ET-AVR Stamp module:
| http://www.futurlec.com/ET-AVR_Stamp.shtml
| has eight(8) 10 bit A/D converters that can be used for measuring
| temperatures as well as a bunch of I/O for turning things on and
| off.  There are less expensive controllers but this is the least
| expensive pre-packaged solution I've seen.
|
| The catch is that you have to do all of the programming yourself.
| If you're into this sort of thing it's not a problem.  Tools for
| programming in Ada and C are can be downloaded for free.

Interesting!

Can you post a link I can follow to download a free C-language
toolset?

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Morris Dovey on July 7, 2007, 5:03 pm
 Morris Dovey wrote:
| Steve wrote:
|
|| For example the ET-AVR Stamp module:
|| http://www.futurlec.com/ET-AVR_Stamp.shtml
|| has eight(8) 10 bit A/D converters that can be used for measuring
|| temperatures as well as a bunch of I/O for turning things on and
|| off.  There are less expensive controllers but this is the least
|| expensive pre-packaged solution I've seen.
||
|| The catch is that you have to do all of the programming yourself.
|| If you're into this sort of thing it's not a problem.  Tools for
|| programming in Ada and C are can be downloaded for free.
|
| Can you post a link I can follow to download a free C-language
| toolset?

I'm not sure if this is the right compiler, but just downloaded WinAVR
from SourceForge.

The URL I found is
http://sourceforge.net/project/showfiles.php?group_idh108&package_id
f543&release_idQ1228. Wish me luck...

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/



Posted by Steve on July 7, 2007, 11:17 pm
 
That one works but I think AVR Studio is a bit more polished.  But then I
haven't done a lot of work with either.

Regards,
Steve



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