Subject:
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Re: Use RCX motor output to switch devices
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 28 Aug 2002 22:35:33 GMT
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Viewed:
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871 times
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In lugnet.robotics, Remko Roodselaar writes:
> In lugnet.robotics, Dean Husby writes:
> >
> > "Da Byte" <dabyte@hotmail.com> wrote in message news:H1I03v.n9@lugnet.com...
> >
> > > > Do you mean something like the following?
> > > > http://www.akasa.bc.ca/tfm/lego_ms2.html
> > > >
> > > > Dean
> > >
> > > I have seen that site before, yes, but it doesn't exactly describe what I
> > > want (although I also could implement relays).
> > >
> > > I'd like help on the circuit I have built, please. But thanks anyway.
> >
> > I'm far from any expert but it appears that what you are trying to do is
> > make a solid-state switch.
> >
> > There are two other ways to do this.
> > 1. Use the RCX it's self as the switch. The RCX motor port in OFF mode would
> > be the switch closed and the motor port in FLOAT mode is the switch in open.
> >
> > But I don't know if this is the best idea depending on what your planning to
> > run on it.
> >
> > The safest method would be to use an optoisolator (I think it's called) It's
> > a package with a LED and a Phototransistor in one little package. You'd use
> > the RCX to 'light' it and it would do the same as your schematic but would
> > be electronically isolated. This also allows using two of them with reversed
> > polarity and you can have two switches on one port.
> >
> > Your other option is a relay as that link I supplied showed.
> >
> > Hope that's a little bit of help.
> >
> > Dean
>
> Thanks a lot, Dean!
>
> Total electrical isolation is a good idea to achieve what I'm planning to
> do. I am trying to switch circuits of various Voltages (a 12V circuit at the
> moment in the form of an IR beamer).
> Do you have any information on both creating and buying (parts of) these
> optoisolators? Could one use parts of old (computer) mice?
>
> Thanks again!
>
> Remko
In my "LEGO Mindstorms Interfacing" book published by McGraw-Hill I devote
whole chapter (Chapter 4) on Electronic Switching techniques. I describe
both input/output switching techiques using npn and Power MOSFET transistors
to control RCX and Scout based robots. The book will be on the bookshelves
next month. Here is a link from Amazon.com about the book. Enjoy!!!
http://www.amazon.com/exec/obidos/ASIN/0071402055/qid%3D1030573125/sr%3D11-1/ref%3Dsr%5F11%5F1/002-8245441-6243259
Don Wilcher
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Use RCX motor output to switch devices
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| (...) Thanks a lot, Dean! Total electrical isolation is a good idea to achieve what I'm planning to do. I am trying to switch circuits of various Voltages (a 12V circuit at the moment in the form of an IR beamer). Do you have any information on both (...) (22 years ago, 28-Aug-02, to lugnet.robotics)
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