Subject:
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RE: Using motor as sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 19 Aug 1999 13:01:19 GMT
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Viewed:
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1954 times
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Michael Gasperi wrote:
> I don't see how using it as a motor would hurt the sensor input of the RCX,
> but the motor must have really poor power output.
> I worry about the idea of using the motor as a generator and measuring speed
> with it. I think there are diodes at the input that keep it from going
> negative or above the supply voltage. As a generator, the motor can produce
> a voltage or current high enough to do damage to them. People who have
> tried this have reported feeling that the motor shaft only turns freely in
> one direction. That indicates to me that in the other direction a lot of
> current is flowing somewhere.
Hmm, that probably means that the clamping diode to +5 or GND is missing, and I'll
bet its the one to ground. It also implies that the input resistor to the A/D
circuit is between the clamping diode and the A/D input.
I could be totally wrong here, since I did not bother to "ding out" the
input circuit when I opened my RCX. I may, at some point, do that again
since I really want to know what the input circuit looks like...
Cheers,
Ralph Hempel - P.Eng
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Check out pbFORTH for LEGO Mindstorms at:
<http://www.hempeldesigngroup.com/lego/pbFORTH>
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Reply to: rhempel at bmts dot com
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Message is in Reply To:
 | | Re: Using motor as sensor
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| Eric Brok <brok@fcjsvc.hvu.nl> wrote in message news:FGpJ4w.Hqv@lugnet.com... (...) a (...) thus (...) I don't see how using it as a motor would hurt the sensor input of the RCX, but the motor must have really poor power output. I worry about the (...) (27 years ago, 19-Aug-99, to lugnet.robotics)
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