Posted by hevans66 on Tuesday, May 19, 2009
Recently NerdKits was a sponsor for MIT's annual Battle of the Bands. As we like to turn everything into a DIY project, we took the opportunity to demonstrate yet another awesome application of analog and digital electronics. This project is a particularly good example of the kinds of interesting things you can do when you use a microcontroller as a bridge between the analog and digital domains.
In this video tutorial we show you how to use a piezo electric buzzer in reverse as a microphone to measure the sound level in a room and display it on a giant LED array. The tutorial explains in detail the design of the system including the analog circuit required to amplify the signal from the buzzer.
If this is your first taste of real analog design, don't be scared -- we will try to be gentle!
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