I've always been tempted by the idea of a smart door lock but have never actually taken the plunge, which might explain my recurring interest in the topic... Which is a long-winded way of saying check ...

We've received a review sample of the Lockzo AL501 3-in-1 smart door lock system (Smart Lock + Video Camera + Doorbell). It ...

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 ...