Subject:
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RE: More servo stuff
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 11 Jan 2000 01:36:12 GMT
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Original-From:
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Bill Denzel <wdenzel@polymail.cpunix.calpolyAVOIDSPAM.edu>
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Viewed:
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919 times
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I had the same problem. The servo would run fine if the program was not
doing anything else. But if I was updating the pwm to the motor ports then
the servo would jitter. I figured it was because the extra overhead was
screwing up the timing on the signal wire to the servo. I solved it by
placing a relay on the servo power wire. The relay is powered by a digital
output. So I usually change the servo position in software first, ie servo5
= 4000, then turn on the servo power by setting the digital output high,
wait for about 1 sec, then turn the servo power back off. I was very happy
with this solution because it eliminated the jitter problem and also removed
any battery drain due to the servo at idle. I found that the servo had more
than enough holding torque on its own with no power due to the large gear
ratio.
Bill Denzel
-----Original Message-----
From: news-gateway@lugnet.com [mailto:news-gateway@lugnet.com] On Behalf Of
James Munro
Sent: Monday, January 10, 2000 1:50 PM
To: handyboard@media.mit.edu
Subject: Re: More servo stuff
> Try placing a capacitor across +5V and ground. Get something in the range
> of 0.1 - 0.47 microfarads and just plug it into the headers on the HB. • This
> solved my problems.
I did this but it didn't help. *sigh*
Thanks for the tip!
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Message has 1 Reply:
 | | RE: More servo stuff
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| Hi. We have a problem with servo as well. When we test one servo motor, it works just fine. But when we test more than one, the speed of each servo decreases. Does anyone have similar problem? Thanks for your help. Damee Choi (25 years ago, 1-Feb-00, to lugnet.robotics.handyboard)
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