Arduino Knock Detector Security System

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Hey guys this my knock detector.It detects if your knocks are in the correct pattern and the it unlocks something (eg. door etc. )If it is in the wrong pattern it wont unlock.We should knock with our hand on the door because the piezo element is very sensitive.But here i am using the sensor itself instead of my hand.Doubts and questions would be appreciated.Dont forget to subscribe for more videos.
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