Subject:
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Obj.: r/c servos
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 23 Aug 1999 12:20:57 GMT
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Original-From:
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Philippe Jadin <PHILIPPE.JADIN@spamcakeSKYNET.BE>
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Viewed:
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972 times
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To add more to all those servo information, I've build a servo
controller which use the printer connector on the PC. It doesn't use any
electronic, everything is made by software (Delphi 3.0) It is quite
usefull to try this at home since you'll understand *exactly* how works
a servo motor, it's advantage and disadvantage...
But I'm not sure this could be made with RCX, since timing is very
important.
Every 20 msec (not critical, let's say 60 msec is good also) you have to
send a pulse of a length *between* 1 to 2 msec. The length gives the
position of the servo arm.
Take a look at : http://users.skynet.be/clairetnet/homepage/servo1.htm
(partially translated in english...)
Philippe
Kekoa Proudfoot a écrit :
>
> Robert Munafo <munafo@gcctechNO.SPAMcom> wrote:
> > In lugnet.robotics, lego-robotics@crynwr.com (John Barnes) writes:
> > > [...] This would set the average servo, which needs a pulse from about
> > > 0.7 - 2.0 mS for 180 degress to one of about 45 steps or every 5 degrees
> > > [...]
> >
> > I can't understand this. Can you correct your grammar so it is clear what
> > you're saying the average servo needs?
>
> I think what John was trying to say was that pulse widths between 0.7 ms
> and 2.0 ms give servo rotations between 0 and 180 degrees. With 45 steps
> in that range, you can control the servo in 5 degree increments.
>
> Seems to me he was approximating a bit, since 180 degrees is either 36
> steps of 5 degrees each or 45 steps of 4 degrees each; 45 steps of 5
> degrees each adds up to 225 degrees.
>
> -Kekoa
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
---------------------------------------------------------------------
Philippe Jadin
mailto:philippe.jadin@skynet.be
Belgium, Europe
Simple yet usefull Robot stuff goto
http://users.skynet.be/clairetnet/homepage
For low-cost web design goto http://users.skynet.be/clairetnet
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message is in Reply To:
 | | Re: r/c servos
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| (...) I think what John was trying to say was that pulse widths between 0.7 ms and 2.0 ms give servo rotations between 0 and 180 degrees. With 45 steps in that range, you can control the servo in 5 degree increments. Seems to me he was approximating (...) (25 years ago, 20-Aug-99, to lugnet.robotics)
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