Designing of the Digital Combination Lock System

Abstract

In present world people have seen to be prompted towards more and more sophisticated devices because of their advantageous features and simplicity. Digital combination lock is an electrically powered electronic device that can be used to provide more convenient way in a operation like opening a door instead of using a mechanical lock as used widely. In constructing such a device basic, electronic components like Integrated Circuits (IC) diode, transistor, capacitors logic gates are assembled in to a single unit and to automate the unit computer programs are integrated. Digital combination lock posses a number of advantageous features such as Remote controlling facility through network or Internet, Resetting of numbering codes, Keyless handling facility, Extended life time, Security over mechanical lock and so on a Main objective of this project is to design a digital combination lock in order to provide more convenient way in a operation like opening a door instead of using a mechanical lock and to overcome the drawbacks of presently available locks. In addition study about the logic gates and their functioning as well as study about the practical way of implementing digital combination lock also aimed. Basically, using CMOS ICs, Transistors, Capacitors, Resistors and PB switches interface circuit was constructed in order to transfer data from computer to the electrical equipment to be controlled through port program and usual functioning of the circuit was examined. Since this system has wire connection it can only be used within a limited extent. If IR radiations or radio waves are used instead of wire connection it could be used even for far extent. Just as if it can improve the security further it will be enhanced the value of this system.