I am currently constructing my own anemometer and wind vane. Does
anybody know where to get continuous turn potentiometers? I'm
after a resistance value of 20K if possible.
Peter Homann email: adacel.com.au Work : +61 3 9596-2991 peterh
Adacel Pty Ltd Fax : +61 3 9596-2960
250 Bay St, Brighton 3186, VIC, AUSTRALIA Mobile : 014 025-925
eek - potentiometer? You're on the wrong track.
The approach which will survive the elements is to
use,for direction, an small disk which has four or more
optical tracks implementing a grey code. Put an IR
emitter diode and detector pair on each track. The result
is a 4 or more bit code for wind direction, given the
disk is rotated by a wind vane.
For speed, use one diode pair and a disk with one track
which has lots of fine lines - yielding a tachometer.
the wind speed is proportional. And a cup type aneomometer
assembly rotates the disk.
You can buy this for about $100 or so.
Too hard to build a robust one which survives the weather.
Peter Homann wrote:
> I am currently constructing my own anemometer and wind vane. Does
> anybody know where to get continuous turn potentiometers?
Try Electronic Goldmine Part Number G6958 US$ 3.00
it has 20K, 25K, 15K, and two 10K pots. You may be able to
seperate the ones you do not need. Most of the single
section servo pots are either 1K or 2.5K ohms.
their fax number is (602) 451-9495 in Scottsdale, AZ.
I think that Maplin and Heathkit have the anemometer and wind
vane based on a disk and photodetectors that uses grey code.
Lincoln M C
I think what you need is an optical shaft encoder, Have a look in RS or
where-ever, There are plenty about...
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