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 ...

A US company that makes software for electronic voting machines has taken the unprecedented decision to make public all its proprietary computer code. It hopes this will assuage the fears of voters ...

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 ...