Subject:
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dual servos
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 16 Jan 1997 00:43:15 GMT
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Original-From:
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DAVID.J.DOSTAL@LAWRENCEspamcake.EDU
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Viewed:
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1485 times
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Greetings all,
I have been programming lately using the recently released dual servo
routines. I have noticed that if I enable both servos and simply send each of
them a pulse (servo_a7(or 5)_pulse=3040 for example) they respond faitfully but
then twitch almost imperceptibley every few seconds. The twitch does not seem
to favor either servo, and they both twitch at the same time. This is no big
deal. However I have a program that uses analog input from a potentiometer to
determine a servo pulse value several times a second, and this routine makes
the twitching a serious control issue. I am running the servos off their own
6V supply, so I don't think that I am overtaxing any parts on the board. Any
ideas or similar experiences?
Thank you,
Dave
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Message has 2 Replies:
 | | Re: dual servos
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| There may be two separable issues in your experiment: 1. "twitching" when the control value isn't changing. this should not happen. 2. twitching because of flakiness in the pot reading. this would not surprise me at all. if the A to D reading on the (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
| | | Re: dual servos
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| I'm a newbie at this, but I just read yesterday on a web page that servos want a signal (20 ms = ?? degrees) every 50 milliseconds or so, and if you stop sending the signal, they "go limp" and don't "hold" position tightly, but are deenergized and (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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