The following figure is the main control circuit schematic diagram of the two-color clock without hands of the single-chip microcomputer. As shown in the figure: the AT89S51 single-chip microcomputer is used as the control core, and the 74LS154 (4-16 line decoder) is used to expand the I/O port to control the display of the clock. 12 red LED lights are used to represent hours, and 12 green LED lights are used to represent minutes, which change every 5 minutes. Only two LED lights are on at the same time, which is energy-saving, convenient, easy to identify, and full of personality.
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