【正文】 點亮或蜂鳴器發(fā)聲。（2）溫度檢測部分，本設(shè)計運用數(shù)字?jǐn)?shù)字溫度傳感器DS18B20進(jìn)行溫度檢測。單片機(jī)在寫時序?qū)憯?shù)據(jù)到DS1820，在讀時序從DS1820中讀數(shù)據(jù)，每一總線時序傳送一位數(shù)據(jù)。s，每個寫時序之間必須有至少11181。如果在采樣窗口期間總線為高， “ 1”就被寫入；反之， “ 0”被寫入。s的恢復(fù)時間。 DS1820完成溫度轉(zhuǎn)換必須經(jīng)過三個步驟:每一次讀寫之前都要對DS1820進(jìn)行復(fù)位，復(fù)位成功后發(fā)送一條ROM指令，最后發(fā)送RAM指令，這樣才能對DS1820進(jìn)行預(yù)定的操作。s的存在低脈沖，主CPU收到此信號表示復(fù)位。溫度補(bǔ)償通常采用方法是每次按照公式（33）計算當(dāng)前聲速，進(jìn)行溫度補(bǔ)淮北師范大學(xué) 2022 屆學(xué)士畢業(yè)論文 論文正文20償。具體程序見附錄A。該系統(tǒng)中鎖相環(huán)鎖定需要一定的時間，測得的距離有誤差，在汽車?yán)走_(dá)應(yīng)用中誤差為 1cm 可忽略不計。淮北師范大學(xué) 2022 屆學(xué)士畢業(yè)論文 論文正文22參考文獻(xiàn)[1] 王歡. 基于 CAN 總線的倒車?yán)走_(dá)研究[J]. 哈爾濱工業(yè)大學(xué)， [2]趙保全. 中國集成電路大全[M]．北京：國防工業(yè)出版社，1985．[3] 中國集成電路大全編委會. 中國集成電路大全 集成運算放大器[M]. 北京：國防工業(yè)出版社，1985.[4] [M].北京:機(jī)械工業(yè)出版社,2022[5] 楊明發(fā). 高性價比倒車?yán)走_(dá)的研究[J].《機(jī)電技術(shù)》季刊，福建省機(jī)械科學(xué)研究院， 2022年01期， pp3031[6] 何希才. 集成電路及其應(yīng)用實例[M]. 科學(xué)出版社, [7]蘇長贊. 紅外線與超聲波遙控[M]. 北京：人民郵電出版社，.[8] 康華光. 電子技術(shù)基礎(chǔ)[M]．北京：高等教育出版社，2022.[9]金濠芷，王明時． 現(xiàn)代傳感器技術(shù)．北京：電子工業(yè)出版社，1995[10] 51 單片機(jī) C 語言教程：入門、提高、開發(fā)、拓展全攻略[M].北京:電子工業(yè)出版社,2022淮北師范大學(xué) 2022 屆學(xué)士畢業(yè)論文 論文正文23附錄 A 程序includeinclude define uchar unsigned chardefine uint unsigned intuchar code table[]=0123456789。uchar realtemp。sbit DQ=P2^6。 // 定義蜂鳴器端口sbit Trig=P3^1。//液晶數(shù)據(jù)命令選擇端sbit dula=P2^6。 for(a=0。}void delay(uint z){uint x,y。y0。P1=。lcden=0。delay(5)。}void init(){wr=0。write_(0x38)。//顯示清零，數(shù)據(jù)指針清零}/***************ds18b20***************/void delay1(uchar i) //12Mhz 的晶振 ,T=(i*2+5)us{while(i)。 k++)。 //單片機(jī)拉低總線 delay1(250)。}//18B20 寫命令函數(shù)void write_DS18B20(uchar cmd){ uchar i。_nop_()。_nop_()。//5us DQ=cmd amp。 //右移一位 } DQ = 1。 for (i=8。_nop_()。_nop_()。_nop_()。 //4us if(DQ) byte|=0x80。}//讀出溫度函數(shù) void read_temp() { init_DS18B20()。 //轉(zhuǎn)換 mdelay(750)。 write_DS18B20(0xBE)。0xf8。 //若低８位全為０且溫度為負(fù)，取補(bǔ)時就要向高位進(jìn)１temp_l=~temp_l+1。 bai=c/100。 write_(0x85+0x40)。delay(1)。delay(1)。for(num=0。}} void temzhi(void) 、 、函數(shù)功能：溫度值計算 { read_temp() 。while(1){for(i=0。}SPK=1。}} void deng()//告警提示燈函數(shù){uchar l。 } else if (l50) { Rd=~Rd。 delay(50)。 //打開總中斷 0 TMOD=0x10。 //延時 20us Trig=0。 EX0=1。 //計數(shù)溢出標(biāo)志 TR1=1。 //關(guān)閉外部中斷 0 temzhi()。 //厘米 display()。 //沒有回波則清零 test = !test。//至成功測量的標(biāo)志 EX0=0。在本論文的寫作過程中，方正國老師傾注了大量的心血和汗水，給我提出了許多寶貴的意見。還要感謝長期以來給我諸多幫助的同學(xué)們，你們的友情將是我一生最值得珍惜的財富和最值得懷念的情感。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal.Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i.If you are worried about how the time limits apply to you, take advice from one of the anisations listed under Further help.Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation.Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help.淮北師范大學(xué) 2022 屆學(xué)士畢業(yè)論文 論文正文30If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as a damagesbased agreement. In England and Wales, your solicitor can39。s 150th anniversary celebrations and will attend City39。s governing body, has also ordered an immediate investigation into the referee39?；蛟S是愧疚于自己似乎把轉(zhuǎn)瞬即逝的很多個不同的日子過成了同一天的樣子；或許是追溯過去，對自己那些近乎偏執(zhí)的怪異信念的醒悟，這些天以來，思緒一直很凌亂，在腦海中不斷糾纏。 Junior high school, thought to have a crush on just means that the real growth, but over the past three years later, his writing of alumni in peace, suddenly found that isn39。二十年的人生軌跡深深淺淺，突然就感覺到有些事情，非做不可了。s plaint. In a statement the Russian side added: We found no racist insults from fans of CSKA.Age has reached the end of the beginning of a word. May be guilty in his seems to passing a lot of different life became the appearance of the same day。s about how he felt and I would like to speak to him first to find out what his experience was.Uefa has opened disciplinary proceedings against CSKA for the racist behaviour of their fans during City39。re clear about the terms of the agreement. It might be best to get advice from an experienced adviser, for example, at a Citizens Advice Bureau. To find your nearest CAB, including those that give advice by , click on nearest CAB.For more information about making a claim to an employment tribunal, see Employment tribunals.The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa39。g an employment tribunal claiEmployment tribunals sort out disagreements between employers and employees.You may need to make a claim to an employment tribunal if:? you don39。在這里在對他表示由衷的感謝。 TL1=0。 //取出定時器的值 timeL =TL1。 deng()。 if(succeed_flag==1)淮北師范大學(xué) 2022 屆學(xué)士畢業(yè)論文 論文正文28 { time=timeH*256+timeL。 //等待測量的結(jié)果 TR1=0。 //定時器 1 清零 TL1=0。 //等待 Echo 回波引腳變高電平 succeed_flag=0。 //關(guān)總中斷 Trig=1。 Trig=0。 Rd=1。Gd=0；Rd=0；While（1）｛ if(l100) { Gd=~Gd。else if (d50)淮北師范大學(xué) 2022 屆學(xué)士畢業(yè)論文 論文正文27 delaysk(10)。i++)// //喇叭發(fā)聲的時間循環(huán)，改變大小可以改變發(fā)聲時間長短 {del