Subject:
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Re: ABB irb340 PickMaster
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 1 Feb 2001 03:44:41 GMT
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Original-From:
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Steve Baker <SJBAKER1@AIRMAIL.nospamNET>
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Reply-To:
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SJBAKER1@AIRMAILantispam.NET
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Viewed:
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1167 times
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Rebel Transcanner wrote:
> I'd love to try using servos sometime; but until I can find a practical way
> to get more than two positions, I think I'm going to have to stick to using
> LEGO gearmotors with potentiometers... :(
The problem is that servo's are driven by signals that are considerably narrower
than the 1/100th second resolution timers that the Lego firmware provides. They
use pulse-width modulation - so the width of the pulse determines the position
of the servomotor. In a real radio controlled model, the servo's are given new
position pulses 50 times a second - and you can have at least 8 servo's on a
single controller. That means that these devices are going to want a pulse
in the 1 to 2 millisecond range - and the Lego firmware simply can't do that.
HOWEVER, if you use LegOS and a C program, I would *expect* there to be something
that you could do without difficulty since I'm sure the underlying timer hardware
is MUCH more precise than 1/100th second.
--
Steve Baker HomeEmail: <sjbaker1@airmail.net>
WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
Projects : http://plib.sourceforge.net
http://tuxaqfh.sourceforge.net
http://tuxkart.sourceforge.net
http://prettypoly.sourceforge.net
http://freeglut.sourceforge.net
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Message has 1 Reply:
 | | Re: ABB irb340 PickMaster
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| "Steve Baker" <lego-robotics@crynwr.com> wrote in message news:3A78DBA9.F3C3D2...ail.net... (...) way (...) using (...) narrower (...) They (...) position (...) new (...) a (...) pulse (...) that. (...) something (...) hardware (...) Well, (...) (24 years ago, 1-Feb-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: ABB irb340 PickMaster
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| "Ralph Hempel" <rhempel@bmts.com> wrote in message news:NEBBIJADEJHLFJD...mts.com... (...) Ralph, I'd love to try using servos sometime; but until I can find a practical way to get more than two positions, I think I'm going to have to stick to using (...) (24 years ago, 31-Jan-01, to lugnet.robotics)
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