Having a secret lock on your home or valuables can provide an extra layer of protection and security. In an emergency, a covert lock could even save your life by keeping intruders out. Fortunately, with some basic electronic components, I was able to create my own clandestine electronic lock. In this article, I will walk through my process of building a hidden DIY electronic lock from start to finish.

Understanding the Components

Before starting construction, it is crucial to understand the components that make up an electronic lock system. Here are the main elements:


The keypad is where the user inputs the code to unlock the system. For my lock, I used a 12-button numeric keypad with buttons from 0-9 plus * and #. The keypad connects to the control board.

Control Board

The control board receives input from the keypad and triggers the lock mechanism. I used an Arduino microcontroller board for the brains of my system.

Lock Mechanism

The lock mechanism is what physically locks and unlocks when the proper code is entered. For my secret lock, I installed a 12V electric deadbolt lock.

Power Source

An electronic lock needs a power source. I used a 12V battery pack to power my Arduino and lock mechanism.

Constructing the Lock

With my components selected, I could start building my concealed electronic lock system.

Installing the Keypad and Control Board

First, I wired the numeric keypad to the input pins on my Arduino control board. I soldered the connections for a reliable linkage.

Connecting the Lock Mechanism

Next, I connected the electric deadbolt lock to the output pins on the Arduino. I used a diode and relay to isolate the components.

Powering the System

I connected the 12V battery pack to the Arduino and lock mechanism using the proper voltage regulators. This powered the entire electronic lock system.

Mounting the Components

I mounted the Arduino board, battery pack, and wiring inside a hidden box. The numeric keypad was installed covertly in a secret location. The lock mechanism was embedded inside my door.

Programming the Code

Using the Arduino IDE, I uploaded a sketch to program my secret code into the lock system. Now it will only unlock when the correct code is entered.

Testing and Troubleshooting

I tested the lock thoroughly and troubleshot any issues until everything functioned properly. I also programmed a reset function to prevent the system from locking me out.

Installing and Using Your Clandestine Lock

Once constructed and tested, you can install your covert DIY electronic lock in your home or valuables closet. Here are some tips for getting the most security from your secret system:

With proper installation and use, your clandestine electronic lock can provide improved security and peace of mind. In an emergency, your DIY system could even safeguard your family, home, or prized possessions when needed most.


Constructing my own covert electronic lock took some effort, but was a very rewarding DIY security project. With the right electronic components, tools, and knowledge, you can build a secret lock system for your unique needs. Just make sure to plan carefully, test thoroughly, and use your clandestine system responsibly. A concealed electronic lock provides another layer of protection that could save your life one day!

Let me know if you have any other questions on constructing your own covert DIY lock system. I'm happy to provide more details on the process and components needed to build an effective secret electronic lock. With some diligent work, you can engineer a system that keeps your valuables and loved ones safe.