Arduino Servo Motor Knock Lock tutorial

In this project I build a circuit with a servo and a piezo to function as a locking mechanism that can be unlocked when it receives a number of knocking sounds within a given range. http://amzn.to/2ifN3FD You can help support this channel by using the Amazon affiliate link above for any of you future Amazon purchases. I will receive a small commission from Amazon at no additional cost to you which will enable me to produce continuing content for this channel. Thank you for your support.