_____________________________________________________________________________________________________ *Corresponding author: E-mail: gesnewx@yahoo.co.uk; Physical Science International Journal 12(3): 1-15, 2016, Article no.PSIJ.29472 ISSN: 2348-0130 SCIENCEDOMAIN international www.sciencedomain.org Design and Implementation of Electronics Equipment Security Lock System D. T. Agana 1 , F. N. Gesa 2* and C. A. Chile 3 1 Science Laboratory Technology (SLT), Federal Polytechnic Nasarawa, PMB 001 Nasarawa, Nasarawa State, Nigeria. 2 Department of Physics, College of Science, University of Agriculture, Makurdi, PMB 2373, Benue State, Nigeria. 3 Department of Science Laboratory Technology, Fidei Polytechnic Gboko, Benue State, Nigeria. Authors’ contributions This work was carried out in collaboration between all authors. Author DTA designed the study and wrote the first draft of the manuscript. Author FNG wrote the protocol/proof-read the write up while author CAC perform the test/analyses of results. All authors read and approved the final manuscript. Article Information DOI: 10.9734/PSIJ/2016/29472 Editor(s): (1) Bheemappa Suresha, Department of ME, The National Institute of Engg, Mysore, India. (2) Christian Brosseau, Université de Bretagne Occidentale, France. Reviewers: (1) Fatih Baçiftçi, Selçuk University, Turkey. (2) S. Vaithyasubramanian, Sathyabama University, India. (3) João Francisco Ribeiro Negrão, Federal University of Pará (UFPA), Brasil. Complete Peer review History: http://www.sciencedomain.org/review-history/16794 Received 13 th September 2016 Accepted 27 th October 2016 Published 4 th November 2016 ABSTRACT The work presents the design and implementation of a Central Electronic Equipment Security Lock System - a security and access control system for used in public and private organisations as a means to restrict unauthorized access to valuable electronics equipment. The system interfaced the microcontroller (PIC16F877A) to the 16 x 2 Liquid Crystal Display (LCD) which is used to communicate/display the visual outputs to the user, multiplexed keypad (4 x 3) as input unit, three relays (30A, 12V) that serve as isolators and the buzzer-a warning device that gives an alarm when a wrong password is encoded. When the correct password is entered, the system grant access to the user and upon entry of a wrong code three times, the system gives a sound alarm via a buzzer showing that unauthorized person has tempered with the property being secured. By this, the user can also choose which equipment to grant access to (switch on) or not. The system is programmed using Assembly language and MPLAB compiler IDE to grant access to a single load or multiple loads either automatically or manually. The regulated power supply of the system showed a Original Research Article