Subject:
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RE: dual servo update
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 21 Jan 1997 17:12:11 GMT
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Original-From:
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Chuck McManis <cmcmanis@freegate.netAVOIDSPAM>
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Viewed:
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1970 times
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Two things to note in the servo investigation:
> Wiring a 1000microf electrolytic across the 6V within inches of each
> servo seems to work.
This supplies a reserve of current to the servos, and that allows them to
seek to their desired position faster.
> However, a much more important fix has been disconnecting the
> servos from the wall jack and running them off of a 6V battery pack instead.
> I was using a high quality regulated DC power supply, but nonetheless
> it seemed to be making trouble.
Two servos, when moving, can pull two AMPS of current. Thats 2000mA. Two
large servos can pull four AMPS. Very few 'wall bug' type supplies can provide
this level of power (if they do, they are usually of the pregnant snake variety,
you know, a cord that plugs into the wall, a big brick in the line, and then a cord
that plugs into the appliance)
> all that I can say is that the shorter and less complicated
> the routine, the beter the servos behave.
Servos also must get a pulse at *LEAST* every 20mS. So perhaps there are
times where you miss one now or then. Since they can take pulses more
often than that perhaps Fred or someone can reduce the cycle time to compensate
for times when the processor is too busy to get back to them in time?
--Chuck
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Message has 1 Reply:
 | | RE: dual servo update
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| (...) I send my servos commands every 32.768 mS, and they work fine. I don't know what the limit is, but I don't think that 20 mS (50 Hz) is critical. * Michael L. Ross/C33 | Lockheed Martin Eng & Sci Svcs Co. **** * Robotics Department | 2400 Nasa (...) (28 years ago, 22-Jan-97, to lugnet.robotics.handyboard)
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