The following figure is a single-chip color watch hands-free control circuit schematic. Figure shows: The AT89S51 microcontroller core, the use 74LS154 (4-16 line decoder) Expansion I / O port to control the display of the watch, and uses 12 red LED indicates hours, 12 minutes, the green LED light indicates , every five minutes, changes once. At the same time only two LED lights, energy-saving, convenient and easy to identify, and full of personality.
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