Subject:
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Re: Controling LEGO trains via Decta Control Lab
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 29 Oct 1998 18:13:42 GMT
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Viewed:
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5894 times
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I was hoping someone would post a solution to the software platform. I would
even kill for just the low level API to the control lab direct and write my
own Visual Basic OCX for it. The LOGO development environment is a bit forgien
to me and is really kind of clumsy.
The minimun granularity that I have been able to achieve is 1/10 sec. The
pulsing idea came from one of the LEGO engineers in Boston. At the time I
didn't remeber this 1/10 sec limitation to further question him :( If any one
at LEGO is reading this I would be discrete wiht your e-mail address. :)
Thanks for all the help and comments. If anyone know even a friend of a friend
that has tech data on the Contrl Lab API that would be great.
SteveB
Matthew Bates writes:
> 10Hz is nowhere near fast enough to control a train motor using PWM (pulse
> width modulation). You need at least 100Hz, and higher would be better.
>
> Any of your suggestions will vary the speed of a motor, but the most common is
> varying the duty cycle. Varying the frequency of a fixed width pulse can be
> bad as you are likely to pass through some annoying resonant (audible)
> frequency of the motor. Varying the voltage of the pulse is ok, but if you can
> do that you might as well just send variable DC to the motor like the train
> controller does.
>
> I'm not really familiar with the Dacta control lab, but isn't there some
> sensible software that'll let you program it in C or something?
>
> Matt
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Message has 1 Reply:
 | | Re: Controling LEGO trains via Decta Control Lab
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| I don't know if this is the type of program you are looking for, but there is a graphical programming environment called "LEGO Engineer" on the following site: (URL) stumbled across it while looking for any information on the Control Lab itself. It (...) (28 years ago, 9-Nov-98, to lugnet.robotics)
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Message is in Reply To:
| | Re: Controling LEGO trains via Decta Control Lab
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| 10Hz is nowhere near fast enough to control a train motor using PWM (pulse width modulation). You need at least 100Hz, and higher would be better. Any of your suggestions will vary the speed of a motor, but the most common is varying the duty cycle. (...) (28 years ago, 29-Oct-98, to lugnet.robotics)
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