Easy secret knock detector to trigger anything with only an Arduino and a few cheap components

This tutorial guides you through creating a secret knock detector using an Arduino, a piezo transducer, and other components. It covers setting up the circuit, understanding the concept, and implementing the code. The tutorial explains how to differentiate between soft and hard knocks and how to program the Arduino to respond to a correct sequence of knocks. By the end, you'll be able to create a system that performs an action when a secret knock is detected.

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