Xref: utzoo sci.electronics:4418 rec.models.rc:1115 Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!ames!xanth!mcnc!decvax!tektronix!tekecs!nobody From: nobody@tekecs.TEK.COM (-for inetd server command) Newsgroups: sci.electronics,rec.models.rc Subject: Re: pressure transducers Keywords: airspeed, R/C models Message-ID: <10708@tekecs.TEK.COM> Date: 6 Dec 88 17:09:30 GMT References: <848@earvax.UUCP> <2810@kitty.UUCP> <5084@boulder.Colorado.EDU> Reply-To: philb@ptolemy.GWD.TEK.COM (Phil Biehl) Distribution: na Organization: Tektronix, Inc., Wilsonville, OR Lines: 49 In article <5084@boulder.Colorado.EDU> ciciora@tramp.Colorado.EDU (Ciciora) writes: >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 Didn't the Voyager Mars Lander (talk about r/c!) use something like this? My understanding was that four were used spaced at 90 degree intervals which allowed direction as well as speed to be measured. I don't quite see how one would determine the direction but this might be neat to play around with. If anyone has ever done anything with this I'd like to hear about it. It would make a neat addition to a home weather station. regards, Phil Biehl usenet: ...!{decvax,hplabs,zehntel,reed,uw-beaver}!tektronix!orca!philb csnet: philb%orca@tektronix.csnet mail: Tektronix Inc., IDG MS 61-028, POB 1000, Wilsonville OR 97070 work ph: (503)685-2122 usenet: ...!{decvax,hplabs,zehntel,reed,uw-beaver}!tektronix!orca!philb csnet: philb%orca@tektronix.csnet work ph: (503)685-2122 mail: Tektronix Inc., IDG MS 61-028, POB 1000, Wilsonville OR 97070