By default the knock is shave and a haircut but you can program it with anything up to 20 knocks long.
Secret knock detecting door lock using arduino.
A piezo is an electronic device that generates a voltage when it s physically deformed by a vibration sound wave or mechanical strain.
Demonstration video for arduino based knock pattern detecting smart door lock.
Jacob clarke 14 488 views.
With your arduino plugged into your computer open the serial monitor window on the top right of sketch window.
Press the button to record a knock pattern then test it by knocking.
After six times knock arduino find the knock pattern and save that in eeprom.
After it arduino decodes it and compares with saved pattern.
This section assumes that you know how to connect your arduino microcontroller to you.
Secret knock detecting door lock step 1.
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.
Similarly when you put a voltage across a piezo it vibrates and creates a tone.
Tools supplies and skills.
Now after saving the input pattern press and immediately released the push button for taking input from the sensor to arduino to open the lock.
You should see the text program start tap the microphone and it should say knock starting and knock each time you tap it.
Stop for a second or two and you ll probably see secret knock failed.
Some examples are pir based security system rfid based security system digital lock system bio matrix systems electronics code lock.
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.
This project will take several hours to complete.
Hi all i ve done a bunch of modifications to steve hoefer s code for his secret knock detecting door lock.
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.
Secret knock detecting door lock using arduino duration.
Press the programming button and knock a new knock and it will now only open with your new knock.
Now we have to knock 6 times.
For the complete project with circuit diagram and code visit.
This tutorial shows you how to use a piezo element to detect vibration in this case a knock on a door table or other solid surface.
