Subject:
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RE: Motor Sensor (fwd)
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 9 Jun 1999 01:02:47 GMT
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Original-From:
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Jim Choate <ravage@EINSTEIN.ssz.com=ihatespam=>
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Viewed:
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943 times
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----- Forwarded message from Tilman Sporkert -----
From: "Tilman Sporkert" <tilman@activesw.com>
Subject: RE: Motor Sensor
Date: Tue, 8 Jun 1999 17:47:52 -0700
Getting useful readings from that is another matter. As stated earlier, the
RCX reads voltages between 0 and +5V. So if you run the motor in the wrong
direction, you get a reading of 0. If you run it in the right direction,
then you will probably get a very limited range of values. You won't be able
to tell +5V from anything higher, like +6V or +7V. What's the output voltage
curve of a generator with no load attached to it? It might rise to high
voltages quickly, maybe even to voltages that might damage the RCX.
----- End of forwarded message from Tilman Sporkert -----
These are DC motors, you better get a reverse current (and as a consequence
reverse voltage) or else that motor has some sort of diode in it.
The output voltage is directly related to magnetic field strength and the
speed at which the field gets cut by the wire. The reality is the output
will be pulsed DC because the magnets inside the DC motor aren't continous
(usualy) but normaly set at quadrature.
It's unlikely that any voltage that the motor can generate will damage
the RCX for a variety of reasons.
____________________________________________________________________
Never underestimate the stupidity of some of the people we
have to deal with.
William A. Reinsch, BoXA to Congress
The Armadillo Group ,::////;::-. James Choate
Austin, Tx /:'///// ``::>/|/ ravage@ssz.com
www.ssz.com .', |||| `/( e\ 512-451-7087
-====~~mm-'`-```-mm --'-
--------------------------------------------------------------------
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | RE: Motor Sensor (fwd)
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| (...) Yes, you get a reverse current, but the RCX won't be able to measure that. Anything below 0V will read the same as 0V (RAW = 0), and anything above +5V will read as 1023 in RAW mode. Tilman -- Did you check the web site first?: (URL) (25 years ago, 9-Jun-99, to lugnet.robotics)
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