FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Binary coded decimal, comparators, electronic locks, logic, registers, switching
The design, construction and implementation of a 2-digit electronic locking system for crime and intrusion prevention is reported in this work. The electronic locking system was designed and constructed using simple circuit elements and implemented with digital electronic logic gates. Like a conventional key, the electronic lock accepts a 2-Digit code, compares it to the stored code in its memory via a comparator and switches on or off any device connected to it if both codes match or mismatch. The device makes use of a keypad for data entry achieved with a Binary Coded Decimal (BCD) Encoder IC (74C922), a set of shift register ICs (4035B) for memory and a set of 4001 quad NOR and 4070 quad EX-OR logic gates for comparing and a relay for switching. During testing, the result showed that the device switches ON or OFF any electronic device connected to it if both codes match or mismatch.
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