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Posted by Morris Dovey on December 26, 2007, 11:04 pm
 
sylvan butler wrote:
| wrote:
|| I still haven't solved the flow sensor problem, but think that I
|| may be able to cobble one together using a little CPU fan and an
|| opto-isolator, tied to the 1-wire daisy chain.
|
| I recommend putting a 1-wire counter on the output of the opto.
| Then
| the software just has to read the count instead of trying not a
| miss a tick.  (this is the way the 1-wire wind speed and rain gauge
| are built, and you could probably use the rain gauge conversion
| board for your counter.)

Looks like a winner. I just pulled down the DS2423 spec sheet and
suspect that just one of the four 32-bit counters should be enough.

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



Posted by Jeff on December 26, 2007, 12:58 am
 
Morris Dovey wrote:

   Don't hold out too much hope for the CPU fan. The magnets in them
give   a strong cogging. You can try stripping them out and see if the
fan moves in a slight breeze.

   Jeff

  and an


Posted by Morris Dovey on December 26, 2007, 9:25 pm
 Jeff wrote:
| Morris Dovey wrote:

|| http://www.iedu.com/DeSoto/Projects/Monitor/

|| I still haven't solved the flow sensor problem, but think that I
|| may be able to cobble one together using a little CPU fan
|
|    Don't hold out too much hope for the CPU fan. The magnets in them
| give   a strong cogging. You can try stripping them out and see if
| the fan moves in a slight breeze.

I stopped by my local computer emporium and picked up a 50 mm fan for
$. It cogged, exactly as you said - so I pulled the hub/blade
assembly and found a plastic magnetic ring around the inside the hub.
I pulled the ring out and reassembled the fan.

Now it turns if I so much as /think/ airflow at it. There's a photo of
it at the link below (again, next to my keyboard for scale).

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/Projects/Monitor/Anemometer.jpg



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