http://cegt201.bradley.edu/projects/p...
Bradley University EE Senior Project
By: Andrew Elliott & Nick Hanauer
Advisor: Joel Schipper
This is testing the four microphones attached to external interrupts on the ATmega128. The microcontroller is fast enough to determine which of the four microphones detect the sound first and this is proved by moving a microphone in front of the others and viewing the corresponding LED turn on when a sound is detected.
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