Xref: utzoo sci.electronics:4393 rec.models.rc:1108
Path: utzoo!utgpu!watmath!clyde!att!pacbell!ames!mailrus!ncar!boulder!tramp!ciciora
From: ciciora@tramp.Colorado.EDU (Ciciora; Steven joseph)
Newsgroups: sci.electronics,rec.models.rc
Subject: Re: pressure transducers
Keywords: airspeed, R/C models
Message-ID: <5084@boulder.Colorado.EDU>
Date: 6 Dec 88 04:01:43 GMT
References: <848@earvax.UUCP> <2810@kitty.UUCP>
Sender: news@boulder.Colorado.EDU
Reply-To: ciciora@tramp.Colorado.EDU (Ciciora)
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Organization: University of Colorado, Boulder
Lines: 22

In article <2810@kitty.UUCP> larry@kitty.UUCP (Larry Lippman) writes:
>In article <848@earvax.UUCP>, sbcd@earvax.UUCP (Scott Dynes) writes:
>> I'm looking for help on the following: I would like to get/make an
>> airspeed sensor for R/C models. This would require 1) a small
>> accurate (and light!) pressure sensor that would run off a small set
>> of batteries, and 2) a similarly small, light, low-power way to get
>> the information down to earth. I'm thinking of having the output be
>> a tone whose frequency is proportional to the airspeed. Does anyone
>> know of such a system, or where to look for the individual pieces?

  -a)  Bust a small light bulb.
  -b)  Run a constant current through it.
  -c)  Measure the voltage accross it vs air speed.

I once wanted to measure air speed and this was the method sugested.
Never really calabrated it, though.  Not sure how.  It was interesting
to send the output to a O'scope and look at the fluctuations of a fan,
person walking by, blowing, etc.  Made a nice lunch-break hack.

Hope this helps,

Steven Ciciora