The following figure is the main control circuit schematic diagram of the two-color needle less clock of the single chip microcomputer. As shown in the figure, taking AT89S51 single chip microcomputer as the control core, 74ls154 (4-16 line decoder) is used to expand the I / O port to control the display of the clock, and 12 red LED lights are used to represent hours and 12 green LED lights are used to represent minutes, which change every 5 minutes. At the same time, only two LED lights are on, which is energy-saving, convenient, easy to identify and full of personality.

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