Subject:
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Re: Anyone know how to build a stall sensor?
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 6 Sep 2001 18:01:29 GMT
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Viewed:
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1540 times
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In lugnet.robotics.rcx, Rob Stehlik writes:
> In lugnet.robotics.rcx, Paul Andrews writes:
> > Hi,
> >
> > I'd like to be able to monitor the current being drawn by a motor using the
> > RCX (not the CyberMaster :-( ), so that I can detect stalls and possibly
> > spins. I can't believe that this is particularly hard but I can't find any
> > references to one on the web and I'm not a hardware kind of guy so I don't
> > really know where to start.
> >
> > Has anyone done this? Can anyone point me at schematics/build instructions?
> >
> > Regards - Paul.
>
> Hi Paul,
> I was interested in doing the very same thing a while ago. It sure would save
> on sensors if the motors had their own feedback! I know (as you are probably
> aware also) that the current can be monitored using the cybermaster. I saw how
> Bert Vandam used this trick to shut off a compressor when the pressure got high
> enough. Check out www.bvandam.net
> I actually emailed Bert and asked him if this was possible with an RCX. He said
> that only the cybermaster can monitor current. So, as it stands, the RCX
> does not have this capability. Now, maybe with some replacement firmware this
> would be possible... Please let me know i you find anything out,
> Rob
Yes. I found on article on using the battery voltage to determine the same
thing, i.e. more current, less volts. To do it you need replacement
firmware. I use leJOS (a Java VM), I'm one if the developers, so I could go
in that way.
I'm going to try and use the battery voltage for collision detection and an
IR transmitter/light detector combo for collsion avoidance. Result: an
apparently sensorless robot.
It'll be interesting anyway.
Still It'd be nice to have a dedicated stall sensor.
Regards - Paul
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Message is in Reply To:
 | | Re: Anyone know how to build a stall sensor?
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| (...) Hi Paul, I was interested in doing the very same thing a while ago. It sure would save on sensors if the motors had their own feedback! I know (as you are probably aware also) that the current can be monitored using the cybermaster. I saw how (...) (23 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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