Subject:
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Re: Chaining multiple RCX's output to input
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 27 Oct 1999 14:31:20 GMT
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Viewed:
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505 times
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Eric Brok <brok@fcjsvc.hvu.nl> wrote in message
news:FK9Lxs.49z@lugnet.com...
> Another variety is using a motor as a sensor(!). It only takes a small
> manual turn of a new Technic motor to make the RCX or Scout respond, for
> example by driving another motor. Observaton: the sensing motor is much • more
> sensitive in one direction than in the other.
> Does anybody think doing this like this may harm the harware in the longer
> run?
Using a motor as a tachometer has come up before and I used to be worried
about this causing damage. I have it from the LEGO engineers I met at
mindfest that you can not hurt the RCX by hooking a motor to the input and
spinning it at any kind of normal speed. There clearly is a limit to the
voltage protection, but they wouldn't say what it was. The reason it
appears to only work in one direction is the inputs only work with the
voltage in one polarity. When you spin the motor in one direction it
generates a positive voltage and negative when you spin it backwards. The
RCX can't measure negative voltage.
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Message has 1 Reply:
 | | Re: Chaining multiple RCX's output to input
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| (...) Pop a 10K ohm resistor in series with the motor. On my quick test with a variable resistor I got a value of 513 with the resistor at 9.7k. With a 10k resistor, the RCX raw value is now flickering between 510 and 511. P.S. same with the older (...) (25 years ago, 27-Oct-99, to lugnet.robotics)
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Message is in Reply To:
| | Chaining multiple RCX's output to input
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| While attending Michael Gasperi's workshop at Mindfest it occured to me that, from his investigations, it should be functional and harmless to connect the output of an RCX to the input of another RCX. Last night I connected my RCX to my Scout and it (...) (25 years ago, 27-Oct-99, to lugnet.robotics)
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