摘要

本电路以P89C58 单片机为中心、采用A44E 霍尔传感器测距，实现对出租车里程统计，并进行计价。采用看门狗电路MAX813L实现上电复位、手动复位和监视电压功能，时钟芯片DS1302在系统掉电的时保存单价、里程、车轮长度等信息和显示时间，人机界面采用液晶显示，为减小功耗可将液晶屏背光灯设为手动可调。并采用炜煌A6热敏打印机打印基本信息。本电路设计的计价器不但能实现计价功能，而且还能根据白天、黑夜自动调整计价模式，中途等待处理以及为避免一些作弊行为设计的防作弊功能。经检测本设计基本实现了设计要求的基本和发挥部分，同时还有一定的创新

-Summary

P89C58 microcontroller circuit in the center of Hall sensor distance by A44E and realize taxi mileage statistics, and for pricing. Achieved by the watchdog circuit MAX813L on reset, manual reset, and voltage monitoring functions, the system clock chip DS1302 power-down time stored in the unit price, mileage, wheels, and display the length of time such information, human-computer interface with liquid crystal display, to reduce Power LCD backlight can be set manually adjustable. And Wei Huang A6 thermal printer used to print basic information. The circuit design of the meter can not only realize pricing function, but also according to day and night modes automatically adjust pricing, halfway to wait for processing, and cheating in order to avoid some of the design of anti-cheat functions. The design tested the basic design requirements to achieve a basic and play some, as well as some innovative