Practical digital calendar design: design the circuit of the system is based on AT89S52 microcontroller as the core controller, the peripheral circuit mainly consists of the clock module, keyboard module, LCD module, alarm module and PC communication module and etc.. This electronic clock not only has the basic functions of electronic clock, and has the following functions: set the alarm time, the alarm clock music selection, display date and week display, the lunar new year, through the PC machine on the Internet time synchronization, PC communication with the PC machine will display a friendly interface and a series of functions. The whole system uses single chip C51 language to program, and the communication interface of PC has VB programming to realize various functions of its design.

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