If a piezo speaker hears the right number of.
Secret knock locking door.
A microphone okay really a speaker presses against the door and listens for knocks.
Tools supplies and skills.
Agptek 60kg 130lbs holding force electric magnetic lock for door access control system electromagnet fail safe nc mode.
In the old movies a little sliding door would open so the doorman could check you out and let you in.
This project will take several hours to complete.
Secret knock detecting door lock step 1.
More buying choices 16 11 2 used new offers.
Unlock the door with a secret knock.
Free shipping on your first order shipped by amazon.
With ismailsan s electronic lock the secret knock automatically unlocks the door.
If it hears the right number of knocks in the right cadence it triggers the motor to turn the deadbolt and unlock the door.
Get it as soon as fri sep 18.
This section assumes that you know how to connect your arduino microcontroller to you.
In this project i used an arduino uno a piezo speaker and a servo motor.