Multi-function digital clock design. Requirements: the use of single-chip microcomputer to realize intelligent digital clock should have the following functions: 1. Dynamic display of time and time (LCD LCD), the error is less than or minus 10%; 2. Have alarm function; 3. Important event reminder function; 4. Liquid crystal display has the anti-explicit selection function. Pick to Multi-function digital clock in electronic products research and development and manufacturing occupies very important position, its main function is to dynamic display of time, and have many functions such as alarm clock and important event to remind, wide range of USES, far-reaching significance. This course design provides for the use of single-chip microcomputer to make a simple multi-function electronic clock. Using the AT89S51 MCU programming to generate digital signal, and the driver to complete the display function of LCD1602. At the same time, the digital signal is amplified by amplifying circuit to drive the buzzer to produce alarm. The key control switch can adjust the clock time and the setting of alarm time.

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