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 03:18:03 GMT
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Viewed:
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746 times
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"Steve Baker" <lego-robotics@crynwr.com> wrote in message
news:3CEAAE66.783CD469@airmail.net...
> ....For relatively slow rotation speeds, you can use a pendulum with a
> rotation sensor at the fulcrum (probably geared so you get several • rotations
> of the sensor for one swing of the pendulum).
Ok... I didn't have any rotation sensors - but now I've bought two from
bricklink - that is probably cheaper and easier than buying inclinometers,
etc.
> ....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...
> 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...
> 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...
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Message has 2 Replies:
 | | Re: super cheap tilt sensor?
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| (...) Yes - that's right. (...) 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 (...) (23 years ago, 22-May-02, to lugnet.robotics)
| | | Re: super cheap tilt sensor?
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| I saw this, and I came up with an idea that some might consider cheating (...) Could you create a runner to stand between the wheels, with a rotation sensor on it? the only connection between the runner and the body of the bike would be a shaft to (...) (23 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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| (...) It somewhat depends on how rapidly the tilt can change - and whether you intend to try to keep the robot level or just to know how much it's tilted by. For relatively slow rotation speeds, you can use a pendulum with a rotation sensor at the (...) (23 years ago, 21-May-02, to lugnet.robotics)
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