Tony:

I remember an article a friend once showed me where Bob Pease (author of
Electronic Design magazines "Pease Porridge" column) made an anemometer by
breaking the glass envelope of a small bulb and monitoring the current
through it - which provides a means of indirectly measuring airspeed...

I did a quick search but failed to find the exact article, but these may be
of interest:
http://www.elecdesign.com/1998/may2598/ifd/2IFD.pdf
http://www.elecdesign.com/Articles/Index.cfm?ArticleID=15177&Extension=pdf
http://www.elecdesign.com/Articles/Index.cfm?ArticleID=15175&Extension=html
http://www.elecdesign.com/Articles/Index.cfm?ArticleID=17245&Extension=pdf

After reviewing the responses so far, it appears that most are thinking
along the same lines. I've tried it acoustically in the past (with
ultrasonics) but ran into issues such as cavity resonances due to nearby &
surrounding enclosures and turbulence/flutter causing difficulties in
resolution... my guess is that the majority trend of heat loss due to air
movement is the more practical approach.
Bruce.

-----Original Message-----
From: Tony Nixon [mailto:tony.nixon@ENG.MONASH.EDU.AU]
Sent: Wednesday, October 23, 2002 2:34 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [PIC]: data logger


Hi all,

A while back I made a small data logger using Dallas temperature chips
and a humidity sensor controlled by a 16F873.

Now the person wants to measure "wind" velocity as well.

However, the catch is that the wind, if you can call it that, is
actually the small variations in air movement in an average ventilated
room such as in an office.

I haven't got a clue how to measure something like that.

Any ideas :-)

--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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