Subject:
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Re: Rotation Sensors - slightly dissapointed...
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 28 Feb 2000 19:55:15 GMT
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Original-From:
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Robb Greathouse <rob@opengrid.netSPAMCAKE>
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Viewed:
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1018 times
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I've used old mouse rotation sensors in non-lego projects with some success.
They employ a laser counter. The device can be easily connected to a basic
stamp. If the counter disk is sealed against contaminantion it works well.
Robb,
----- Original Message -----
From: Ben Jackson <ben@ben.com>
To: <lego-robotics@crynwr.com>
Sent: Friday, February 25, 2000 10:28 AM
Subject: Re: Rotation Sensors - slightly dissapointed...
> In lugnet.robotics, Michael Gasperi writes:
> > In lugnet.robotics, Iain Hendry writes:
> > > The program ran successfully for about 20 seconds before I noticed motor • 1
> > > had shifted out of phase by 22.5 degrees - it had slipped/skipped a • count.
> >
> > Because the LEGO Rotation sensor is a powered type, it might be slightly
> > sensitive to battery voltage.
>
> If you check the legOS group you can see my posts with some extensive • analysis
> of the sensor values for the rotation sensor. There is a patch to make • legOS
> less sensitive to voltage fluctuations and one to debounce the input • (which is
> what probably causes missed counts on the standard firmware as well). I • was
> working on very similar designs to those being discussed in this thread, • and
> with my changes (using legOS, of course) you get the expected behavior, • with no
> missed (or extra) counts.
>
> I doubt you can get very high precision from the stock firmware.
>
> --Ben
>
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Message has 1 Reply:
 | | RE: Rotation Sensors - slightly disappointed...
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| Mmmm, your triggering some thoughts. A mouse is a pretty simple (serial) device Imagine having a robot which has a mouse-ball in a DUPLO block carried over the surface In this way you could record the path the robot has taken. Doing a bit of (...) (25 years ago, 29-Feb-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Rotation Sensors - slightly dissapointed...
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| (...) If you check the legOS group you can see my posts with some extensive analysis of the sensor values for the rotation sensor. There is a patch to make legOS less sensitive to voltage fluctuations and one to debounce the input (which is what (...) (25 years ago, 25-Feb-00, to lugnet.robotics)
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