基于單片機控制的車速里程表設計

摘 要
近年來隨著計算機在社會領域的滲透, 單片機的應用正在不斷地走向深入，同時帶動傳統(tǒng)控制檢測日新月益更新。在實時檢測和自動控制的單片機應用系統(tǒng)中，單片機往往是作為一個核心部件來使用，僅單片機方面知識是不夠的，還應根據(jù)具體硬件結(jié)構(gòu)，以及針對具體應用對象特點的軟件結(jié)合，以作完善。 模擬多通道壓力系統(tǒng)是利用壓力傳感器采集當前壓力并反映在顯示器上，它可以分析壓力過量程，并發(fā)出報警。并采用電子秤原理可根據(jù)輸入單價準確的計算出物體的金額。本篇論文討論了簡單的倒計時器的設計與制作 ，對于倒計時器中的四位LED數(shù)碼顯示器來說，我為了簡化線路、降低成本，采用以軟件為主的接口方法，即不使用專門的硬件譯碼器，而采用軟件程序進行譯碼。
 
關(guān)鍵詞 單片機，AT89S51， LED數(shù)碼管顯示器， keil C51，倒計時器

ABSTRACT
Permeate in the social realm along with the calculator in recent years, single slice the application of the machine just at constantly alignment thorough, arouse a traditional control an examination a day a new moon benefit renewal in the meantime.In solidly the hour the examination the single slice that controls with auto the machine the application the system, single slice machine usually Be a core parts to use, only single slice the machine aspect knowledge is not enough, return should according to concrete the hardware structure, and aim at concrete application the software of[with] the object characteristics combine to make perfect. Imitating many passage pressure systemses is to make use of pressure to spread the feeling machine to collect current pressure combine the reflection is on the display, it can analyze the pressure surfeit distance, erupting to report to the police.Combine the adoption electronics steelyard principle can according to input the amount of money that the unit price computes an object accurately
This thesis discuss that pour the design and creation of the timer in brief, for pour four LED figures displays in the timer to say, I am for the sake of the simplification circuit,decline low cost, adopt to take software as the connect of lord a people's method, do not use specialized hardware to translate the code machine namely, but adopt the software procedure to carry on translating code.

Keyword：single slice machine，AT89 S51，The LED figures tube display，Keil C51，Pour timer
 
目錄

第 1 章 緒  論 1
1.1課題背景 1
1.2車速里程表的簡介組成及原理 1
1.3設計的整體思路 3
第 2 章 硬件的設計 6
2.1單片機簡介 6
2.2 AT89C52系列單片機的介紹 7
2.3里程表各部分電路介紹 9
2.3.1霍爾傳感器電路 9
2.3.2定時計數(shù)器電路 11
2.3.3外部中斷 12
2.3.4 74HC573驅(qū)動器 13
2.3.5LED顯示模塊電路 15
第 3 章 軟件的設計  17
3.1普遍系統(tǒng)的總體設計 17
3.2單片機應用軟件的一般設計 17
3.3車速里程表的軟件設計 19
3.3.1總體設計思路 19
3.3.2子程序和主函數(shù)的設計 20
第 4 章 軟件調(diào)試 23
4.1程序的檢測與調(diào)試 23
4.2PROTEUS仿真過程 25
結(jié)束語 28
參考文獻 29
致  謝 30
附錄一 硬件設計原理圖 31
附錄二 程序清單 32
附錄三 元器件清單 38