基于at89c51單片機倒車防撞報警系統(tǒng)設(shè)計-免費閱讀
【正文】 另外，我還要特別感謝學長和學姐以及一起做畢業(yè)論文的同學們對我的無私的幫助和論文的寫作的指導，使我得以順利完成論文，在此我也衷心感謝他。當在探測范圍內(nèi)有障礙物時，發(fā)光二極管以一定的頻率閃爍，閃爍的頻率以距離定，距離越近頻率越高，同時蜂鳴器提示報警，距離越近蜂鳴器的報警時間間隔越短，當距離小于最小安全距離時，蜂鳴器不間斷報警。 //開定時器0中斷 ET1=1。 //開定時器0TR1=1。c16。a++) { Write_date(table0[a])。Icden=1。Icdrs=1 。 //稍作延時是為了數(shù)據(jù)穩(wěn)定_nop_()。result=(bit)(P0amp。/bit lcd_busy(){bit result。delay(10)。write_(080+040+010)。 Long=*time。} 超聲波接收及顯示程序Void duqu(){ Uchar num。_nop_()。i1。4腳：接地端。低功耗空閑和掉電模式 AT89C51的結(jié)構(gòu) AT89C51的結(jié)構(gòu)框圖 CX20106芯片介紹使用CX20106A集成電路對接收探頭受到的信號進行放大、濾鏡。1000次擦寫周期超聲傳感器的指向圖由一個主瓣和幾個副瓣構(gòu)成，其物理意義是0度時電壓最大，角度逐漸增大時，聲壓減小。因此，超聲波接收傳感器具有很好的頻率選擇特性。超聲波發(fā)生器內(nèi)部結(jié)構(gòu)有兩個壓電晶片和一個共振板。在空氣中傳播超聲波，其頻率較低，一般為幾十KHz，而在固體、液體中則頻率可用得較高。超聲波傳感器有發(fā)送器和接收器，但一個超聲波傳感器也可具有發(fā)送和接收聲波的雙重作用。關(guān)鍵詞：單片機 超聲波 AT89C51AbstractWith the development of society and economy of transportation industry is booming, the number of cars in the sharp rise. Traffic congestion has bee more and more serious, the crash occurred repeatedly, resulting from the inevitable casualty and economic loss, in view of this situation, design a kind of fast response, high reliability and more economy car collision avoidance warning system to be imperative, ultrasonic ranging method is the most mon type of distance measuring method, this paper describes the use of ultrasonic locating design a backdraft anticollision alarm system.The content of the thesis is based on the AT89C51 singlechip integration, design based on AT89C51 backdraft anticollision alarm system. The system uses a bination of hardware and software, the method of module, and multiuse characteristics. This paper summarizes the development and basic principle of ultrasonic detection, introduces the principle and characteristics of ultrasonic sensor. Some of the main parameters for the system were discussed, and introducing ultrasonic ranging system functions basis, the overall position of the system, through a variety of transmitting and receiving circuit design parison, the best design scheme, and various system design unit this paper introduces the principle of. On the position of the system circuit chip are introduced, and elaborated the princ
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