Subject:
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Re: Voltage generator
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 20 Jan 1999 18:59:54 GMT
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Original-From:
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Peter Hesketh <pbh@phesk.demon.coANTISPAM.uk>
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Viewed:
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1103 times
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In article <Pine.GSO.3.96.990120090008.21321D-100000@frodo.uen.org>,
jeff <jeff@uen.org> 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.
Wait for a calm day and mount it 3 ft above a car, or on the front of a
bike with a speedometer. Make several runs in opposite directions at
constant speed and take the average.
Alternatively, drill a hole half way along a broom handle and place it
on a lidless record player. Put the anemometer at one end and a
counterbalance at the other. Speed can be calculated from radius and
rpm.
> You'd need to place a resistor in
> line to help avoid damage to the RCX though.
It depends on the motor and the speed of the wind. and anyway, a
resistor on its own would not necessarily reduce the voltage. A series
resistor and parallel zener diode would be safest.
Another way is to attache a propeller to a rotation sensor. No voltage
limiting required.
--
Regards - Peter Hesketh, Mynyddbach, Mon.
Forty reasons why a dog is better than a woman: number 19
"You don't dread a visit from a dog's parents"
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: Voltage generator
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| Bill, 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. You'd need to place a resistor in line to help avoid damage to (...) (26 years ago, 20-Jan-99, to lugnet.robotics)
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