單片機(jī)倒車防撞警報系統(tǒng)設(shè)計論文正文(參考版)
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【正文】 我會銘記大學(xué)克服奮斗的歷程，今后工作中會努力拓展電子信息工程的領(lǐng)域。同時我還要感謝在我學(xué)習(xí)期間給我極大關(guān)心和支持的各位老師以及關(guān)心我的同學(xué)和朋友。在大學(xué)階段，我在學(xué)習(xí)上和思想上都受益非淺，這除了自身的努力外，與各位老師、同學(xué)和朋友的關(guān)心、支持和鼓勵是分不開的。論文從選題、結(jié)構(gòu)安排、文字處理直至最終定稿的全過程無一不是在張老師的悉心指導(dǎo)、嚴(yán)格要求和親切關(guān)懷下完成的。ultrasonic distance measurement。[22] Miles UpT0n. Techinques For Distance Measurement SAE95. 2003:167[23] :人發(fā)交通出版社,1997:157Reverse collision warning system based on single chip designWei Shizhao (Department of Physics, DeZhou University, Dezhou, 253023)Abstract: Is day by day prosperous along with the social economy development transportation shipping industry, the auT0mobile quantity climbs in the first mate. Traffic congestion condition also day by day serious,the collision event occurred repeatedly, has caused the inevitable person casualties and the economic loss, in view of this kind of situation,designed one kind T0 respond quickly, the reliability was high also a more economical auT0mobile guards against hits the early warning system imperative, the ultrasonic wave range finding was the most mon one distance range finder method, this article introduces is guards against using the ultrasonic wave range finding design one kind of backdraft hits the alarm system.The paper is based on the contents of the AT89C51 monolithic integrated circuit reverse collision avoidance system design, mainly using ultrasound features and advantages, ultrasound ranging system and the integration with the integration AT89C51 monolithic integrated circuit, AT89C51 monolithic integrated circuit based on the design of a reverse collision avoidance warning systems. The system used software and hardware integrated approach of a modular and multiuse characteristics.This paper, a simple distance measurement principle, a collision warning system, analyzes the design principle of reversing anticollision system and the design of some ponents, fully describes the principles and application of ultrasonic distance measurement, and introduced China39。 102。參考文獻(xiàn)[1] 朱月秀，單片機(jī)原理與應(yīng)用(第二版).北京:科學(xué)出版社, 2004:2[2] 周良權(quán)，傅恩錫, (第2版).北京:高等教育出版社, 2001:121123[3] :[碩士論文],華中科技大學(xué)碩士學(xué)位論文, 2004:4[4] , 1998:56[5] :電力工業(yè)出版社, 1980:32[6] 李鳴華，, 1998:157[7] , 2002:117[8] :電子工業(yè)出版社, 2003:108110[9] , 2005:246[10] , 2001:143149[11] 董子和,:1516[12] ,北京:機(jī)械工業(yè)出版社, 1994:16[13] , 2005:89[14] , 2004:215[15] 李全利, :高等教育出版社, 2004:1214.[16] :長安大 學(xué),2004:126[17] :長安大學(xué),2004:66[18] :長安大學(xué),2004:63[19] :清華大學(xué),2004:41[20] Gabriel leen, Dond Heffernam,and alan Dune. Digital Networks in the AuT0motive Computing amp。但是，該系統(tǒng)的測量距離有限，只有在10300cm距離情況下可表現(xiàn)比較明顯的線性關(guān)系。通過掌握了系統(tǒng)的工作流程，設(shè)計了該系統(tǒng)的主程序、顯示子程序和蜂鳴報警程序。文中對超聲波測距的原理和實現(xiàn)進(jìn)行了詳細(xì)論述，并詳細(xì)介紹了AT89C51的內(nèi)部結(jié)構(gòu)以及各管腳的功能。流程圖及部分源程序如圖42所示。8155的PA口作為LED的字形輸出口，PC口作為LED的位選控制口，采用共陰顯示接法。 顯示子程序和蜂鳴報警程序考慮到提高系統(tǒng)資源的利用率，顯示采用動態(tài)顯示法實現(xiàn)。RECEIVE0：PUSH PSWPUSH ACCCLR EXO；關(guān)外部中斷0MOV R7，THO；讀取時間值MOV R6，TL0CLR CMOV A，R6SUBB A，0BBH；計算時間差MOV 31H，A；存儲結(jié)果MOV A R7SUBB A，3CHMOV 30H，ASETB EXO；開外部中斷0POP ACCPOP PSWRETI 計算超聲波傳播時間T0中讀取出來的時間差數(shù)據(jù)并不能作為距離值直接顯示輸出，因為時間差值與實際的距離值之間轉(zhuǎn)換公式為S=*V*T。前方測距電路的輸出端接單片機(jī)INT0端口，中斷優(yōu)先級最高，左、右測距電路的輸出通過與門IC3A的輸出接單片機(jī)INT1端口，中斷源的識別由主程序查詢來處理，中斷優(yōu)先級為先右后左。IC2是帶有鎖定環(huán)的音頻譯碼集成塊LM567，內(nèi)部的壓控振蕩器的中心頻率f0=1/，電容C4決定其鎖定帶寬。選定的是INT0口，工作方式為脈沖方式。 超聲波的接收與處理超聲波的接收是由外部中斷口INT0是否有中斷脈沖產(chǎn)生來判斷的。工作原
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