Subject:
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Re: r/c servos
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 20 Aug 1999 21:20:53 GMT
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Viewed:
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994 times
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In lugnet.robotics, Kekoa Proudfoot writes:
> 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 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.
That doesn't make sense either. If a single step of 2.0 ms causes 180 degrees
of rotation, then how does 45 steps allow you to control it 5 degrees at a
time?
> 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.
Are you saying that the servo actually operates in steps of one degree each?
I'm interested in all this because servos sound like they might be useful!
- Robert Munafo http://www.mrob.com
LEGO: TC+++(8480) SW++ #+ S-- LS++ Hsp M+ A@ LM++ YB64m IC13
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Message has 2 Replies:
 | | RE: r/c servos and firmware
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| Ok, Here's my 2 cents on servos...read to the bottom if you are interested in helping to develop the code for this. The servo takes a 60Hz (approx) pulse width signal between 1 and 2 msec The pulses are fed into a little circuit that generates an (...) (25 years ago, 20-Aug-99, to lugnet.robotics)
| | | Re: r/c servos
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| (...) Let's say a 0.7 ms pulse results in a rotation of 0 degrees. Let's say a 2.0 ms pulse results in a rotation of 180 degrees. If all you had were 0.7 ms pulses and 2.0 ms pulses, you'd be able to choose either 0 degrees or 180 degrees, resulting (...) (25 years ago, 20-Aug-99, to lugnet.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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