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Yeah, to be honest, finding the correct frequency was BY FAR the hardest part of this project. The microphone I bought was a super cheepo one, and doing signal processing on the Arduino was not an easy task. I'm also not sure how effective the process I chose was, it seemed to work alright, but definitely could use improvements.
Shattering Wine Glasses With Sound!
Shattering Wine Glasses Wit...View Instructable »