Updated: Aug 22, 2020
Knocking through this circuit can open the door easily. Can be lost by giving your own password. The component needed to make it would be a microcontroller or arduino, One relay, One buzzer or SPK, One electronics locker and some components. Watch the video below for more information.
There will be a connection with the microcontroller on this circuit. SPK to Arduino Analog Pin A0, Programming Button to Arduino Digital Pin 2, Electronic Locker to Arduino Digital Pin 3, Red LED to Arduino Digital Pin 4, Green LED to Arduino Digital Pin 5. And some Components.