College students have returned in droves to dorms and apartments at campuses everywhere. So this is the time of year we usually start seeing some coded entry hacks. [Charmonkey] recently took on the ...

[Jeremy Blum] wrote in to share his LibeTech QR Code Door Lock project. He developed it during his Senior year at Cornell University along with three of his classmates. It seeks to move away from ...

Amazing Door Lock! diy Making Secret Door Lock with Nut Bolt I Coded Door Lock ...

The house key is one of those things you often search for when your hands are full. Smart locks promise relief here and aim to make everyday life more convenient–without compromising security. They ...

The main principle of this circuit is that the door lock opens only when the buttons in series are pressed at a time. We can use it to lock the doors and for other security purposes. This article ...

Would you be surprised to learn that the first mechanical lock and key were invented about the same time as the first message encoding keys? Mechanical security keys, for doors, gates, living spaces, ...