Subject:
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Re: Weird RCX electrical ideas
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 1 Sep 2003 03:57:37 GMT
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Viewed:
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849 times
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<snip>
> Last year I was thinking about the fact that the motor outputs send pulses of
> current. So, I was wondering if the {input} ports were polled fast enough to
> sense this. The idea was you could hook up a motor output from one RCX to an
> input port of a second RCX, creating a physical link between them for
> communication. This would be advantagous in situations where the two RCXs' IR
> ports can't "see" each other.
>
> I took my RCX to the electronics lab at school and hooked it up to an
> oscilloscope. I really wish I had written down what my professor and I saw,
> but the pulses were very fast; I believe they were 20ms each. If that number
> is incorrect, it's due to my failing memory, but I know for sure they were in
> the millisecond range.
Well Jordan I know a little about DC motor theory. In essence a DC Motor and a
DC Generator are the same thing. The amount of ripple (i.e. the frequency of
the pulses although frequency is a bad term to use) is dependent on 2 things:
the speed of the input shaft and the number of commutation points the machine
has. The commutation points are fixed by machine construction. As far as
controlling motor speed, I don't know if you could get speed low enough for the
RCX to pick up the pulse (if indeed the RCX can detect the pulses).
-Orion
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Message has 1 Reply:
 | | Re: Weird RCX electrical ideas
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| (...) I got a private email that said this: Jordan, this idea is a good one. and has proved to work in the past. if you have 2 rcx's, then try it. heck you can even experiment with just one RCX for proof of concept. run a wire from the motor out to (...) (21 years ago, 1-Sep-03, to lugnet.robotics, FTX)
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Message is in Reply To:
| | Weird RCX electrical ideas
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| I'd like to share two thoughts with you all. They involve the RCX and doing things with it that I'm sure the designers never intended (or thought possible). Oh, if you're reading this in the .trains newsgroup, you can skip over the first thought (...) (21 years ago, 1-Sep-03, to lugnet.robotics, lugnet.trains, FTX)
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