Subject:
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Re: using PWM output to control Lego motors
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Newsgroups:
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lugnet.robotics, lugnet.technic
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Date:
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Wed, 2 Feb 2005 19:38:45 GMT
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Viewed:
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2779 times
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In lugnet.robotics, Rob Hendrix wrote:
> PWM for servo pulse is on a three wire system (Pos, Neg, and data). The
> pulse is a series of different length square waves sent to the servo or ESC
> in a certain length of time. This pulse is then translated by the servo or
> ESC as a "position" it needs to set its output at (whether that be a
> mechanical position [servo] or voltage PWM "position" [ESC].
>
> An ESC converts the servo pulse PWM to a different kind of PWM. This PWM is
> like the one LEGO uses on the RCX. It is a series of square waves which are
> either ON or OFF during a certain length of time to simulate different
> voltages. They theory is to simulate 4.5 volts on a 9 volt system, just
> turn off your power source half the time. PWM like LEGO uses runs on a 2
> wire system (Pos, Neg).
Thank you, this clarifies things for me quite a lot. I was thinking that PWM
was PWM, but now I see the important difference -- one is a means of
transmitting data, and the other is a means for controlling current (integrated
over many pulses).
> Doesn't seem cost effective to buy one receiver and 4 ESCs for your project.
This comment seems to imply that there's a better solution... but I don't see it
at this point. What did you have in mind?
Thanks,
- Joe
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