Secret Knock Detecting Door Lock

Build this project at our next weekend long arduino workshop.

Secret knock detecting door lock.

If the sequence isn t recognized the system resets and listens for knocks again. In this project i used an arduino uno a piezo speaker and a servo motor. By default the knock is shave and a haircut but you can program it with anything up to 20 knocks long. Hi all i ve done a bunch of modifications to steve hoefer s code for his secret knock detecting door lock.

A microphone okay really a speaker presses against the door and listens for knocks. The secret door knocker uses a piezo element to record and detect your secret knock pattern then turns a servo motor that you can connect to your door lock. In this post let us build a secret knock detecting door lock using arduino which can detect the pattern of your knocks at the door and will only open the lock if the knocking pattern matches with the correct pattern. In the old movies a little sliding door would open so the doorman could check you out and let you in.

With ismailsan s electronic lock the secret knock automatically unlocks the door. Unlock the door with a secret knock. Secret knock detecting door lock. If a piezo speaker hears the right number of.

Some examples are pir based security system rfid based security system digital lock system bio matrix systems electronics code lock. Press the programming button and knock a new knock and it will now only open with your new knock. Use your favorite song morse code whatever. Protect your secret hideout from intruders with a lock that will only open when it hears the secret knock.

We use the arduino uno but any standard arduino is appropriate for this project. This is the changes that i ve made added a hall effect sensor to determine if the door is open or closed swapped the gear motor with a servo added a serial lcd feedback screen added a yellow led added a bunch of extra features.