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 00:11:40 GMT
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Original-From:
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Daniel Miller <danielmi@*spamcake*expert.cc.purdue.edu>
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Viewed:
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2486 times
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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. :)
I know the logic of taking two sensors and differentiating to find
direction. I was looking for a way to do it with only one. I don't know
if what I proposed (do a 360 scan, then return to loudest) can be done
with the Spirit library; I think it would need arrays. A better thing
would be to compare the current amplitude to the last. However, the robot
would then go to the first sound it "saw" rather than the loudest.
I was cruising TRU looking for deals this afternoon and saw a dish-type
directional mike. It was rather garish, I suppose so Junior's parents can
tell when he's listening in. But I think it would look pretty nifty on a
'bot.
Daniel "Dan'l" Miller Senior, School of Aeronautics and
danielmi@expert.cc.purdue.edu Astronautics, Purdue, Indiana
danielmi@cartoon.ecn.purdue.edu
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Message has 1 Reply:
 | | Re: Homebrew sensors?
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| (...) 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. (26 years ago, 14-Nov-98, to lugnet.robotics)
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Message is in Reply To:
| | Re: Homebrew sensors?
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| There is a single channel sound sensor on my web page: (URL) 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 (...) (26 years ago, 13-Nov-98, to lugnet.robotics)
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