On 25/03/2011 22:15, cdb wrote:
> Way back in the late 90's or early 00's the UK magazine Practical and
> Everyday Electronics (EPE magazine) did a 2 part ultrasonic wind speed
> project.
>
> www.epemag.com
> www.epemag.co.uk
>
> Colin
Thanks
That's the one I was thinking of. I have at least the 1st issue. It's=20
not as neat a design as it could be.

It's not worth copying. The idea is simple and as Olin says you only=20
need three transducers and simple PIC. You do pulse in each pair of=20
transducers, both directions. Sums tell you wind speed and direction.=20
You can also calculate the density. Does this mean you can deduce=20
humidity if you measure temperature and pressure?
--=20
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