Subject:
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Re: Ultrasonic Sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 6 Feb 2002 12:41:53 GMT
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Viewed:
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1837 times
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lego-robotics@crynwr.com (Steve Baker) writes:
> Lee Wilson wrote:
>
> I guess the first question I'd ask is "What interface does the sensor
> present to the RCX?"
>
> I imagine there are two possibilities: It could be a raw interface that let
> you send an acoustic "PING" on command and read a voltage back telling you
> the amount of reflected acoustic energy (so you'd have to time the return
> trip in software)
Sound travels on the order of 333m per second, so with the 3ms interval
between sensor readings you will get a resolution of 1m.
You could try some heavy machine level hackery inside
legOS or leJOS to read the sensors in a shorter interval,
I think you can trade accuracy for time.
But I doubt A/D conversion can become fast enought to be useful.
Jürgen
--
Jürgen Stuber <stuber@loria.fr>
http://www.loria.fr/~stuber/
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Message is in Reply To:
 | | Re: Ultrasonic Sensor
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| (...) I guess the first question I'd ask is "What interface does the sensor present to the RCX?" I imagine there are two possibilities: It could be a raw interface that let you send an acoustic "PING" on command and read a voltage back telling you (...) (25 years ago, 6-Feb-02, to lugnet.robotics)
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