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 19:12:51 GMT
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Original-From:
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jeff <jeff@uen#SayNoToSpam#.org>
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Viewed:
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851 times
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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 making a windmill that would connect to a Lego
motor, and reading the resulting current with the RCX. Have to see about
that still - yet I'd love to have a Lego wind sensor.
Thanks,
Jeff D. Payne
UtahLINK Network Operations
On Wed, 20 Jan 1999, Jim Thomson wrote:
>
> 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 2 Replies:
 | | Re: Voltage generator/Anemometer
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| Jim: Would not the readings gleaned from a motor only be valid when the motor is already turning and has overcome "stick-tion" and the back-emf that would be created when it tried to move the motor? Also, using something as crude as coat hanger and (...) (25 years ago, 22-Jan-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: Voltage generator/Anemometer
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| (...) 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 (...) (25 years ago, 20-Jan-99, to lugnet.robotics)
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