Subject:
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Re: Homebrew sensors?
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 14 Nov 1998 08:28:15 GMT
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Original-From:
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Ben Laurie <ben@algroup.coSTOPSPAMMERS.uk>
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Viewed:
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2332 times
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Daniel Miller wrote:
>
> On Fri, 13 Nov 1998, Michael Gasperi wrote:
>
> > There is a single channel sound sensor on my web page:
> > http://ourworld.compuserve.com/homepages/Michael_Gasperi/lego.htm
> > It was really designed for picking up loud noises like claps. What you want
> > would require two mics and a circuit that would take the difference between
> > the sound levels. Better yet it should have a very narrow bandpass filter so
> > that only sound a particular frequency would be heard. The output would look
> > something like Light values: 50 for equal sounds at both mics, 0 for mostly
> > left mic, and 100 for mostly right mic. The same kind of scheme could be done
> > for temperature to make a heat seeking robot.
>
> I was thinking of something that sensed amplitude, not frequency. (Like
> the light sensor, which sees brightness, not color.) Of course, whatever
> you want for yourself is best. :)
So's Michael - he's proposing a notch filter so you get the amplitude at
a particular frequency, which may be better for a seeking application.
Cheers,
Ben.
--
Ben Laurie |Phone: +44 (181) 735 0686| Apache Group member
Freelance Consultant |Fax: +44 (181) 735 0689|http://www.apache.org/
and Technical Director|Email: ben@algroup.co.uk |
A.L. Digital Ltd, |Apache-SSL author http://www.apache-ssl.org/
London, England. |"Apache: TDG" http://www.ora.com/catalog/apache/
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Message is in Reply To:
 | | Re: Homebrew sensors?
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| (...) I was thinking of something that sensed amplitude, not frequency. (Like the light sensor, which sees brightness, not color.) Of course, whatever you want for yourself is best. :) I know the logic of taking two sensors and differentiating to (...) (26 years ago, 14-Nov-98, to lugnet.robotics)
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