Subject:
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Re: LEGO Purism
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 9 Aug 2002 15:47:03 GMT
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Viewed:
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1571 times
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In lugnet.robotics, John Gerlach writes:
> To Paul: Try running a wire from the RCX power output, to your motor, and
> also to an RCX sensor input. I think you can measure the power draw on the
> motor, if it goes too high you can guess that it has stalled.
>
> RCXs are cool... :-)
Erh, I'm not so sure about that? One side of the sensor input is ground, the
other side is the input to the voltage measurement circuitry. The motor
output on the other hand has two connection, which are either ground and
+8(ish) or +8 and ground depending on the direction (forward or reverse). If
you connect an output to an input, you have a fifty/fifty chance of draining
your batteries quite quickly when you turn the motor output on. And you may
also discover your RCX has warmed quite a lot from it's cool state ;)
As far as detecting an overload state, the sensor input circuitry will only
measure 0 - 5 volts, so while the motor supply is greater than 5 volts
(assuming it's set to the proper direction to avoid the ground short already
mentioned), the input will appear to be just pegged at 1023. By the time the
motor output has dropped to below 5 volts thus giving you something to
measure other than 1023, your motor and batteries will really be working hard!
JB
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Message has 1 Reply:
Message is in Reply To:
 | | Re: LEGO Purism
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| (...) First of all, to Gaff: I also think it is desirable to work within the LEGO system, and I don't consider my mind 'sick and twisted'. Well, maybe a *little* twisted! <grin> To Paul: Try running a wire from the RCX power output, to your motor, (...) (22 years ago, 9-Aug-02, to lugnet.robotics)
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