Subject:
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[MindStorms FAQ 4.5 How do I make a sound sensor?]
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Newsgroups:
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lugnet.faq
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Date:
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Tue, 13 Jul 1999 21:31:21 GMT
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Viewed:
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2615 times
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Subject: 4.5 How do I make a sound sensor?
Content-Language: en
Topic-Level: 0
Revision: Robert Munafo, 1999-07-13
Location: /robotics/rcx/
Comment: Topic-level is inaccurate pending a reference for topic
levels
<p>Passive microphones (the kind that don't use an internal battery) are
essentially sound-dependent resistors and most have a resistance range
that lends well to being used as an RCX input (actually this isn't
quite true -- a microphone is a resistive load in series with a small
current source, but when you put 9 volts across the microphone you can
ignore the small current source). The microphone would be attached and
wired to a LEGO® conducting plate in a way similar to the light and
temperature sensors discussed elsewhere here. Since you probably want
it to be small you should use the "mini condensor" type mic. A
cardioid (directional) mic is probably more useful because it allows
you to determine direction just by rotating. </p>
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Message has 2 Replies:
 | | [MindStorms FAQ 4.5 How do I make a sound sensor?]
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| Subject: 4.5 How do I make a sound sensor? Content-Language: en Topic-Level: 0 Revision: Robert Munafo, 1999-07-14 Location: /robotics/rcx/ Comment: Topic-level is inaccurate pending a reference for topic levels <p>A rather complex circuit is (...) (25 years ago, 14-Jul-99, to lugnet.faq)
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