A HACK A DAY: How to unlock your door with knock codes

This DIY is for the enthusiasts which involves more than just basic electronics knowledge. The gadget built here involves a little programming, but simple enough to follow and make it yourselves. All you need are a few electronic components, and some basic skills for soldering and programming. Once done, you can program it to open your door without a key. You can simply knock on your door and the gadget will open it for you. You can program the gadget / lock to open the door with specific knock codes of your own.

 

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