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 ...

There are many types of security systems used all over the world and Digital Code Lock is one of them. We have already covered many digital locks with simple 16x2 LCD using Arduino, Raspberry Pi, 8051 ...

This simple code lock circuit described here is of an electronic combination lock for daily use. It responds only to the roght sequence of four digits that are keyed in remotely. If a wrong key is ...

Often times, we need to secure a room at our home or office (perhaps a secret dexter’s laboratory) so that no one can access the room without our permission and ensure protection against theft or loss ...

Combination, number code Lock. Vector illustration of a combination lock set with all ten numbers. Protection, security concept. Keypad entry. Realistic style. Abstract technology cyber security ...