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The increasing rate of crime, attacks by thieves, intruders and vandals,despite all forms of security gadgets and locks still need the attention ofresearchers to find a permanent solution to the well being of lives andproperties of individuals. To this end, we design a cheap and effectivesecurity system for buildings, cars, safes, doors and gates, so as to preventunauthorized person from having access to ones properties through the use ofcodes, we therefore experiment the application of electronic devices as locks.However, a modular approach was employed in the design in which the combinationlock was divided into units and each unit designed separately before beingcoupled to form a whole functional system. During the design, we conductedTwenty tests with the first eight combinations being four in number, the nextseven tests being five and the last five combinations being six. This was donebecause of the incorporation of 2 dummy switches in the combinations. From theresult obtained, combinations 8, 11, 13 gave the correct output combination.However, 8 being the actual combination gave the required output. The generaloperation of the system and performance is dependent on the key combinations.The overall system was constructed and tested and it works perfectly.

An electronic digital combination lock: A precise and reliable security system