本设计采用AT89S52单片机为主控器，以A44E霍尔传感器测距，实现对出租车的多功能的计价设计，并采用AT24C01实现在系统掉电的时候保存单价等信息，输出采用8段数码显示管。本电路设计的计价器不但能实现基本的计价，而且还能根据白天，黑夜和中途等待来调节单价。-This design uses AT89S52 microcontroller-based controller to A44E Hall sensor distance, to realize the taxi pricing versatile design and use AT24C01 achieved when the system is powered down to save information such as price, output using 8-segment digital display tube. The circuit design of the meter can not only achieve the basic pricing, but also according to day, night and halfway waiting to adjust price.