Description: The single-chip circuitry to 89S51 as the center, an additional Hall sensor A44E ranging, to realize Taximeter statistics, using AT24C02 realize when the system power-down unit prices and save information such as system time, the output using 8 digital display tube. The circuit design of the meter will not only realize the basic valuation, but also according to the daytime, night, halfway to wait to adjust the unit price, while not denominated as a time clock can also provide convenience for the drivers comrades.
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