Using a hard drive to build an anemometer

[Vlad]

I am using a discarded hard drive as the base of for an anemometer.
I have it running and can generate up to 200 mV a.c. that are ( I
assume) proportional to the wind speed.
The motor has 4 connections to the outside and I can get approximately
the same a.c. voltage from any combination of pairs.
My question is:
Can I use some type of combination ( delta, star etc.) that would
increase the generated voltage?
This connects to a high impedance circuit that converts the a.c. or
d.c. to RS232.
A computer plots the result.

Thanks for the help

Vlad

 

[Wim Ton]

"Vlad" <Bla@dot.com> wrote in message
newsajjr05hm9hkknhp41v0fo508rj1gale1b@4ax.com...

I am using a discarded hard drive as the base of for an anemometer.
I have it running and can generate up to 200 mV a.c. that are ( I
assume) proportional to the wind speed.
SNIP

Maybe an idea for the computer recycling competition organized by the German
publisher Heise (www.heise.de)

Wim

 

[Fred Bartoli]

"Nicholas O. Lindan" <see@sig.com> a écrit dans le message de
news:dksud.1558$Sp3.899@newsread3.news.atl.earthlink.net...

"Roger Lascelles" <invalidl@invalid.invalid> wrote

The trouble with [using a HDD motor as a] tachometer is that output
voltage
is proportional to speed. I have played with such tachometers and found
it
hard to come up with a reliable pulse detection over the large speed
range
of > 100 : 1 you need for wind speed.

Forward into the past:

Sounds like a dose of FM radio is needed: Amplify the piss out of it and
let it clip and clamp so you get a variable frequency square wave.

Of you can use an AGC circuit ...

A PIC, though, will do you no good.

Hmmm...


--
Thanks,
Fred.