This system is composed of 51 single-chip microcomputer system, matrix keyboard, LED display and alarm system. The system can complete the functions of password input, unlocking and over-alarm. In addition to the above basic password lock functions, it also has power-off storage, sound and light prompts and other functions. Other functions can be added according to actual conditions. This system is low-cost, the hardware is easy to obtain, and the functions are practical. Schematic diagram, C language source program, simulation diagram, papers, reference books, etc.
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