基于單片機(jī)控制的車速里程表設(shè)計(jì)

摘 要
近年來(lái)隨著計(jì)算機(jī)在社會(huì)領(lǐng)域的滲透, 單片機(jī)的應(yīng)用正在不斷地走向深入，同時(shí)帶動(dòng)傳統(tǒng)控制檢測(cè)日新月益更新。在實(shí)時(shí)檢測(cè)和自動(dòng)控制的單片機(jī)應(yīng)用系統(tǒng)中，單片機(jī)往往是作為一個(gè)核心部件來(lái)使用，僅單片機(jī)方面知識(shí)是不夠的，還應(yīng)根據(jù)具體硬件結(jié)構(gòu)，以及針對(duì)具體應(yīng)用對(duì)象特點(diǎn)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(dāng)前壓力并反映在顯示器上，它可以分析壓力過(guò)量程，并發(fā)出報(bào)警。并采用電子秤原理可根據(jù)輸入單價(jià)準(zhǔn)確的計(jì)算出物體的金額。本篇論文討論了簡(jiǎn)單的倒計(jì)時(shí)器的設(shè)計(jì)與制作 ，對(duì)于倒計(jì)時(shí)器中的四位LED數(shù)碼顯示器來(lái)說(shuō)，我為了簡(jiǎn)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(jìn)行譯碼。
 
關(guān)鍵詞 單片機(jī)，AT89S51， LED數(shù)碼管顯示器， keil C51，倒計(jì)時(shí)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(jiǎn)介組成及原理 1
1.3設(shè)計(jì)的整體思路 3
第 2 章 硬件的設(shè)計(jì) 6
2.1單片機(jī)簡(jiǎn)介 6
2.2 AT89C52系列單片機(jī)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(shí)計(jì)數(shù)器電路 11
2.3.3外部中斷 12
2.3.4 74HC573驅(qū)動(dòng)器 13
2.3.5LED顯示模塊電路 15
第 3 章 軟件的設(shè)計(jì)  17
3.1普遍系統(tǒng)的總體設(shè)計(jì) 17
3.2單片機(jī)應(yīng)用軟件的一般設(shè)計(jì) 17
3.3車速里程表的軟件設(shè)計(jì) 19
3.3.1總體設(shè)計(jì)思路 19
3.3.2子程序和主函數(shù)的設(shè)計(jì) 20
第 4 章 軟件調(diào)試 23
4.1程序的檢測(cè)與調(diào)試 23
4.2PROTEUS仿真過(guò)程 25
結(jié)束語(yǔ) 28
參考文獻(xiàn) 29
致  謝 30
附錄一 硬件設(shè)計(jì)原理圖 31
附錄二 程序清單 32
附錄三 元器件清單 38