P0.0/AD0-P0.7/AD7 with AT89S51 microcontroller port connected digital tube a-h-side, 8-bit digital control of the S1-S8 through the 74LS138 decoder Y0-Y7 to control the strobe tube each digital The bit select. AT89S51 MCU P1.0-P1.2 control 74LS138 of A, B, C terminal. In the 8-bit digital tube display from right to left circle, " 12345678." Can be smoothed to see the curtain effect.

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