Here is the circuit diagram of Electronic code lock system using 8051 microcontroller. It is very useful at residential places to ensure better safety. This system demonstrates a circuit named ...

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, ...

Charlotte Pfahl, 68, prefers using an old-school mechanical key to access her New York City apartment. So when her landlord modernized the building and installed a smart lock in 2018, she and several ...

This fingerprint-scanning door lock is affordable and simple to set up, but it’s too buggy and probably too arcane for most users. Fingerprint-reading door locks aren’t known for their affordability, ...