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 12:35:46 GMT
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Viewed:
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1341 times
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"Steve Baker" <lego-robotics@crynwr.com> wrote in message
news:3A78DBA9.F3C3D257@airmail.net...
> > 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.
Well, whatever... I'm just going by what it says on Ralph's site. :-/
Iain
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Message has 1 Reply:
 | | RE: ABB irb340 PickMaster
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| (...) The pbForth language has servo driving words built-in to the current release. They allow at least 128 steps of resolution for driving servos. Combined with the dead-simple circuit on my web-page, it makes driving servos very easy... (URL) (...) (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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| (...) 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 (...) (24 years ago, 1-Feb-01, to lugnet.robotics)
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