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1、Abstract: the design with 89S51 singlechip center, additional A44E hall sensor-based ranging, realizes to taxi valuation, using AT24C02 achieve statistical power lost in system when save unit price and the system time wait for information, XianShiGuan with 8 segment digital output. This circuit design can not only realize the meter, but also the basic valuation day and night, can according to wait to adjust the unit price midway through.。

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