Subject:
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Re: Voltage generator/Anemometer
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 20 Jan 1999 18:59:30 GMT
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Original-From:
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Jim Thomson <(95jmt2@eng.cam)Spamcake(.ac.uk)>
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Viewed:
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997 times
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Jeff writes:
> Interesting you should mention that. I've been toying with the idea of
> making a anenometer (wind speed tester) from a motor, but haven't over
> come the idea of how to calibrate it.
I made one some time ago for a project using a bike speedo (one of the
digital ones which comes with a reed switch to go on the forks and a little
magnet which clips on a spoke). This measured the revolution speed of a
windmill type thing made from coat hangers and yoghurt pots.
To calibrate it we drove a car along a straight and empty piece of road with
the anemometer on the roof. We did it in both directions and averaged the
result (to try to cancel out any effect the wind would have). We just used
the car speedo for the speed, though they are notoriously inaccurate. A
measured length of road can of course be used to calibrate the car
speedo.....if you have the time.
For best results it would be wise to mount the anemometer well above the car
to reduce the effects of the air flow being disturbed by the car.
I hope this still counts as being Lego related.
Jim
---------------------------------------------------------------
Jim Thomson, Jesus College, Cambridge. CB5 8BL
Web Page www2.eng.cam.ac.uk/~95jmt2/index.html
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: Voltage generator/Anemometer
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| Jim, Thanks for the info. on your experience. I was thinking of using the car, and was a bit worried about the accuracy problem. Your suggestions are great though and have me believing I'll try something like what you did. I was thinking about (...) (26 years ago, 20-Jan-99, to lugnet.robotics)
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