>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.

Hi,

to measure wind movement I used in the past two NPN-transistors
in a TO92 shape, glued together (thermaly conduced) face to face.

One transistor is used as a resistor and heats the second transistor.

In the second transisor the pn- junction (diode) is used for temperatur
measurement.

There are two possibilities: measure temperature direct with the diode
(about 2mV/K but
not linear), or make a feedback loop (for constant temperature) and measure
the
"heating current".

When wind blows to this configuration thermal energy is moved with it, and
changes
temperature or the "heating current".

With one of the above, only wind / air movement could be detected.

Wind speed could be measured with two devices; one is covered and the other
is in
the moved air. Air temperature is compensated with this configuration.
The difference of both measured values relates to wind speed.

Hope this helps

Thomas

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