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 17:19:45 GMT
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Viewed:
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2446 times
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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).
Doesn't seem cost effective to buy one receiver and 4 ESCs for your project.
-Rob
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Message has 1 Reply:
Message is in Reply To:
 | | using PWM output to control Lego motors
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| In my ongoing quest to control Lego robots by radio, I've uncovered some receivers made by GWS that work with a standard model airplane transmitter, and have 4 channels of standard PWM (pulse-width modulation) output. For example, see (URL). But now (...) (20 years ago, 2-Feb-05, to lugnet.robotics, lugnet.technic)
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