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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Sat, 10 Aug 2002 13:31:22 GMT
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Viewed:
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1590 times
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In lugnet.robotics, John Barnes writes:
> 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.
>
> 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
A little experimentation shows that you are right :-) or should that be :-(
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Message has 1 Reply:
 | | Re: measuring motor voltage on sensor input
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| Quoting Paul Andrews <paul@jools.net>: (...) How about a simple resistive divider across the motor output, say two 1 Kohm resistors, with the motor on the top of the two and the sensor input on the midpoint, so it sees the battery divided by two? (...) (22 years ago, 10-Aug-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: LEGO Purism
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| (...) 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 (...) (22 years ago, 9-Aug-02, to lugnet.robotics)
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