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 12:24:17 GMT
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Original-From:
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Jim Choate <RAVAGE@EINSTEIN.saynotospamSSZ.COM>
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Viewed:
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1078 times
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----- Forwarded message from Tilman Sporkert -----
From: "Tilman Sporkert" <tilman@activesw.com>
Subject: RE: Motor Sensor (fwd)
Date: Tue, 8 Jun 1999 18:46:09 -0700
> 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.
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.
----- End of forwarded message from Tilman Sporkert -----
I have two words....
signal conditioning
What you're looking for is to be able to read gross shaft speed (that's
rpm's and the revolutions part automaticaly implies angular accelleration -
just trying to shutdown the traffic that's going to come over this point)
and direction.
Considering the level of resolution on a DC motor that's pretty poor. So,
what do we do?
Let's assume that the motor puts out a voltage that's +/- 3V depending on
input shaft direction. Re-scale the signal so that all + voltages (say cw
rotation) is 1.5V or greater and that all - voltages are less than 1.5v.
We're also looking to increase the effective (not dynamice) range of the
signal to a 5v swing.
____________________________________________________________________
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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