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Electronics Lab has moved to Tinkercad. Copy your projects to Tinkercad to continue editing your designs. Learn More Got it!

Project 12: Knock Lock

Make your own secret knocking mechanism in this project! A piezo buzzer usually creates vibrations, but this time you will use it as an input to detect how many times someone knocks on your door. You can take things a step further and automatically open a box with a servo motor if someone knocks the right number of times!