Subject:
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Re: using PWM output to control Lego motors
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 2 Feb 2005 22:04:22 GMT
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Original-From:
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Juergen Stuber <juergen@jstuber.net^IHateSpam^>
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Viewed:
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4585 times
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Hi Joe,
"Joe Strout" <joe@strout.net> writes:
>
> 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
> <http://www.aeromicro.com/Catalog/gws_4-channel_pico_receiver__futaba__788636.htm>.
are you sure this isn't for servos?
> But now my ignorance of electronics is tripping me up a
> bit, so please bear with me. My understanding is that the
> RCX uses PWM to control the speed of the motors.
Yes, the RCX uses PWM for power control, in each 8ms period
power is on for 0-8ms and off (disconnected) for the rest.
> So, it seems like I could use the PWM signals from this
> receiver to control the Lego motors too -- right? If
> current or voltage is a problem (which it probably is),
You need 9V and up to 500mA.
> But it's not clear to me exactly what these ESCs do: what are the inputs and
> outputs?
I have the impression that they take PWM input for servos
(pulses of 1-2ms with a much longer time in between)
and turn that into something suitable for motors.
> Are they useful for Lego purposes?
I suppose, if you get the specs right.
Jürgen
--
NO to the planned nodding through of the EU software patent directive!
Jürgen Stuber <juergen@jstuber.net>
http://www.jstuber.net/
gnupg key fingerprint = 2767 CA3C 5680 58BA 9A91 23D9 BED6 9A7A AF9E 68B4
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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 (...) (22 years ago, 2-Feb-05, to lugnet.robotics, lugnet.technic)
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