出租车计价器

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。

关键字：计价器 ；霍尔传感器 ；掉电保护 ； 防作弊

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Taximeter

Abstract

P89C58 SCM to the circuit as the center, using A44E Hall sensor location, and the taxi mileage statistics, and pricing. MAX813L watchdog circuit used to achieve a power-on reset manually reset voltage and surveillance functions, the system clock chip DS1302 preserved when power-down of the unit price, mileage and the wheels and display information such as length of time, human-computer interface using liquid crystal display, Reduce power consumption LCD backlight can be set manually adjustable lamp. Wei Hsin-huang, A6 and a thermal printer basic information. The circuit design of the meter can not only achieve pricing function, but also under the daytime, night automatically adjust pricing model, halfway waiting for the processing and cheating in order to avoid some of the tamper-resistant design features. After testing the basic design to achieve the basic design requirements and play a part, along with certain innovations.

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