单片机AT89C51完成的出租车计价系统
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密 惠 保
摘 要
本毕业设计说明书针对用单片机AT89S51完成的出租车计价系统。
随着经济的发展，带动汽车行业快速发展，出租车日益普遍，了解在出租车上应用的计费系统，对我们日常生活也有帮助。而使用单片机实现该系统，是深化单片机应用的良好途径。
本系统由单片机AT89S51和一些外围原件组成，具有操作简单，显示明了，功能强大的特点。
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整个系统只有两个按键，一个“启动/停止”，一个“复位”；
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使用六个七段数码管作为显示器，可以显示数字、字母使系统信息一目了然；
本系统除了里程统计和费用计算以外，还具有万年历和语音播报功能。
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万年历由时钟芯片DS1302实时提供时钟信号，再由单片机调用显示；
语音播报由语音芯片ISD1420提供语音信息，语音信息放在不同的地址里，由单片机从这些地址中调用合适的语音进行播放。
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本方案充分发挥人性化的特点，利用ISD1420的语音功能，模拟实现带语音提示的出租车计价系统。比较真实地模拟出租车的空车、载客、到站及对各状况的费率的计算、统计、显示和语音播报等功能。
本系统涉及到的理论知识有： AT89S51单片机知识、ISD1420语音芯片的可擦、写的语音芯片的工作原理及应用、实时时钟芯片的工作原理及应用、 出租车计费系统的原理和实现方法。
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关键词：时钟芯片DS1302 语音芯片ISD1420 单片机AT89S51 掉电保护芯片24C02
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ABSTRACT
The abstract this graduation project instruction booklet in view of the rental car which completes with monolithic integrated circuit AT89S51 counts the price system. Along with the economical development, leads the automobile profession fast development, the rental car is day by day common, understood on the rental car the application cost system, also has the help to our daily life.But uses the monolithic integrated circuit to realize this system, is deepens the monolithic integrated circuit application the good way. This system is composed by monolithic integrated circuit AT89S51 and some periphery original part, has the operation to be simple, demonstration perspicuity, function formidable characteristic. Overall system only then two pressed keys, “start/stop”, “replacement”; Uses six seven section of nixietubes to take the monitor, may demonstrate the numeral, the letter cause the system information to be clear; This system besides course statistics and calculation of charge, but also has ten thousand calendars and the pronunciation disseminates news the function. Ten thousand calendars real-time provide the clock signal by clock chip DS1302, again transfers the demonstration by the monolithic integrated circuit; The pronunciation disseminates news by pronunciation chip ISD1420 provides the pronunciation information, the pronunciation information places in the different address, transfers the appropriate pronunciation by the monolithic integrated circuit from these addresses to carry on the broadcast. This plan full display user friendly characteristic, uses ISD1420 the pronunciation function, the simulation realization belt voice prompt rental car counts the price system.Compared with really simulates the rental car the spatial vehicle, carries passengers, to station of arrival and to various conditions tariff computation, the statistics, the demonstration and the pronunciation disseminates news and so on the functions. This system involves the theory knowledge includes: The AT89S51 monolithic integrated circuit knowledge, the ISD1420 pronunciation chip may scratch the pronunciation chip principle of work and the application, the real-time clock chip principle of work and the application, the rental car cost system principle and the realization method which, write.
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Key word: Clock chip DS1302 Ponunciation chip ISD1420 Mnolithic integrated circuit AT89S51 Flls electricity protection chip 24C02 [资料来源：www.THINK58.com]
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