Secret Knock Detecting Door Lock Using Arduino

Now we have to knock 6 times. Similarly when you put a voltage across a piezo it vibrates and creates a tone. 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.

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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.

This project will take several hours to complete. Tools supplies and skills. 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.

Arduino secret door knock unlocker duration. Lay out and test the. After six times knock arduino find the knock pattern and save that in eeprom. This section assumes that you know how to connect your arduino microcontroller to you.

Secret knock detecting door lock using arduino duration. 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. Circuit digest 18 794 views. Press the programming button and knock a new knock and it will now only open with your new knock.

With your arduino plugged into your computer open the serial monitor window on the top right of sketch window. Hi all i ve done a bunch of modifications to steve hoefer s code for his secret knock detecting door lock. After it arduino decodes it and compares with saved pattern. 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.

You should see the text program start tap the microphone and it should say knock starting and knock each time you tap it. 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. Press the button to record a knock pattern then test it by knocking. Jacob clarke 14 488 views.

For the complete project with circuit diagram and code visit. 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. Secret knock detecting door lock step 1.

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.

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