本文以89S51单片机为中心单元、用A44E霍尔传感器进行距离测量,可实现对出租车计价,本设计的计价器不但能实现基本的计价,而且还能分时间段进行调整单价,同时在不计价的时候还能作为时钟为司机同志提供方便.与相应的软件系统相配套使用,得到了较好的效果.%Using the Single chip microcomputer 89S51 as the center unit, by the A44E Howler sensor measuring the distance and take the taxi charge, this meter not only valuation,but also regulation by necessary,and also as a clock. With the software, this circuit has its advantage.
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