Over at NerdKits, Humberto shows how to build a piezoelectric-based sound meter fed to an LED display, using their USB NerdKit. By using the piezoelectric buzzer that comes in the kit as a microphone, and adding a transistor and a few other components, you can create a sound meter and send its output to an LED array, an LCD screen, or other display. They used an LED display version at the recent MIT Battle of the Bands to graphically display the sound volume in the room.
Piezoelectric Sound Meter
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Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. His free weekly-ish maker tips newsletter can be found at garstipsandtools.com.
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