Subject:
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Re: super cheap tilt sensor?
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 22 May 2002 01:58:48 GMT
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Original-From:
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Steve Baker <SJBAKER1@AIRMAIL.saynotospamNET>
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Reply-To:
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sjbaker1@airmailANTISPAM.net
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Viewed:
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676 times
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Luke Wenke wrote:
> > ....If you actually need to know the amount of tilt, you could create a • pendulum
> > that gradually shades from black to white so the brightness returned from • the
> > light sensor directly measures the tilt. Put the whole thing in a black • box
> > so you don't have to take account of the ambient illumination.
>
> I was thinking that you needed to put a light-source in there too... but now
> I remember that the lego light sensor has an LED on it...
Yes - that's right.
> > If the vehicle is going to tilt RAPIDLY - then a pendulum will react too
> > slowly so you'll get wild overshoots and it'll be virtually impossible to
> > make use of the results.
>
> I forgot about that...
I once tried to build a two wheeled robot (like a motorcycle) that would
balance by steering (just like a bike) - but I never did get a tilt sensor
that was fast enough to stop it toppling over without also generating wild
overshoots and basically random swinging.
> > You could try two touch sensors facing each other a short distance apart
> > with a heavy ballbearing between them - that would react pretty quickly -
> > but again would only tell you that the beast has tilted - not by how much.
>
> I can get mercury switches and resistors really cheap... they'd probably be
> better than having a heavy ball bearing hit touch sensors...
Yes - unless you are a Lego purist. (Although come to think of it, I doubt
there is a Lego source for heavy ball bearings either).
----------------------------- Steve Baker -------------------------------
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Message has 2 Replies:
 | | Re: super cheap tilt sensor?
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| (...) I was thinking about a two legged robot - but a motor-bike robot would be pretty amazing. I might try doing that myself. (...) apart (...) quickly - (...) much. (...) be (...) I'm not a lego purist though. What I do is break a 2x4 electric (...) (22 years ago, 22-May-02, to lugnet.robotics)
| | | RE: super cheap tilt sensor?
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| I once tried to build a two wheeled robot (like a motorcycle) that would balance by steering (just like a bike) - but I never did get a tilt sensor that was fast enough to stop it toppling over without also generating wild overshoots and basically (...) (22 years ago, 22-May-02, to lugnet.robotics)
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Message is in Reply To:
| | Re: super cheap tilt sensor?
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| "Steve Baker" <lego-robotics@crynwr.com> wrote in message news:3CEAAE66.783CD4...ail.net... (...) rotations (...) Ok... I didn't have any rotation sensors - but now I've bought two from bricklink - that is probably cheaper and easier than buying (...) (22 years ago, 22-May-02, to lugnet.robotics)
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