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 20:34:22 GMT
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Viewed:
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829 times
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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?
- 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
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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)
| | | Re: r/c servos
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| okay.. how about this.. avg servo needs.. 60hz pulses.. 1.0ms pulse width = end point 1.5ms pulse width = middle of rotation 2.0ms pulse width = other end point that is the form of the data to the servo. so you need to out put pulses 60 times a (...) (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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| If the pwm is really being controlled by an 8 bit counter, that might be fine for the servos. The current rcx output has a cycle time of 8mS and uses 1mS increments. If those are the top 3 bits, then the resolution is 5 bits worth or 0.03mS. This (...) (25 years ago, 20-Aug-99, to lugnet.robotics)
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