Using the P0.0/ ad0-p0.7 /AD7 port of the AT89S51 single chip for the a-h end of the digital tube, the s1-s8 of the 8-bit digital tube was used to control the location of each digital tube through y0-y7 of the 74LS138 decoder. AT89S51 single chip P1.0-P1.2 control of A, B, C terminal of 74LS138. Loop from right to left in 8 digital tubes to show "12345678". Can see the effect of pull curtain smoothly.

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kmsxs.doc

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