Subject:
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Re: Control lego motors and rotation sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 26 Apr 2002 05:41:16 GMT
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Original-From:
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T. Alexander Popiel <POPIEL@WOLFSKEEPstopspammers.COM>
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Viewed:
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738 times
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In message: <3CC8C2BE.F37BB501@airmail.net>
Steve Baker <sjbaker1@airmail.net> writes:
> Jerry Kalpin wrote:
> >
> > Changing the motor 'speed' (pulse wave modulation) really only changes the
> > torque. It will only change the speed if the motor is heavily loaded.
> > Another technique that is more successful is to create a control loop in
> > which the motor is on for 5 ticks and off for (say) 10 ticks. Whatever the
> > load condition the motor will run at 1/3 of full speed.
>
> That's not really any different from what the RCX's firmware does though.
> You are doing pulse-width modulation and so does the firmware.
>
> The only difference is that you are using a longer time-constant.
The standard firmware does pulse-width modulation alternating
between ON and FLOAT. What I think Jerry is suggesting is
pulse-width modulation alternating between ON and BRAKE (which
does control speed quite handily, and is what legOS does).
- Alex
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Control lego motors and rotation sensors
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| (...) That's not really any different from what the RCX's firmware does though. You are doing pulse-width modulation and so does the firmware. The only difference is that you are using a longer time-constant. ---...--- Steve Baker ---...--- Mail : (...) (23 years ago, 26-Apr-02, to lugnet.robotics)
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