畢業(yè)設(shè)計(jì)-基于at89s52、ds18b20單片機(jī)的測溫和時(shí)鐘設(shè)計(jì)(存儲(chǔ)版)
【正文】 on aborted. r plays an important role in this mission. Starting at the ground, conditions have to be very calm winds less than 2 mph, with no precipitation or humidity and limited cloud cover. The balloon, with capsule attached, will move through the lower level of the atmosphere (the troposphere) where our daytoday weather lives. It will climb higher than the tip of Mount Everest ( miles/ kilometers), drifting even higher than the cruising altitude of mercial airliners ( miles/ kilometers) and into the stratosphere. As he crosses the boundary layer (called the tropopause),e can expect a lot of turbulence. The supersonic descent could happen as early as Sunda. The weatheThe balloon will slowly drift to the edge of space at 120,000 feet ( Then, I would assume, he will slowly step out onto something resembling an Olympic diving platform. Below, the Earth bees the concrete bottom of a swimming pool that he wants to land on, but not too hard. Still, he39。t start planning... Those years, those days of do, finally, like youth, will end in our life. 此刻，天空是陰暗的，空氣里有著剛下過雨之后的清新因子。想要的，不想要的，界限明確，好像沒有什么可以撼動(dòng)自己。 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。s governing body, has also ordered an immediate investigation into the referee39。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. If 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。 焊接是兩人合作完成的，也發(fā)現(xiàn)了許多小問題。 if(!key3){kt=3。break。 break。break。 return(t)。 // 啟動(dòng)溫度轉(zhuǎn)換 delay(200)。 dat=1。 } /******************************************************************/ /* 寫一個(gè)字節(jié) */ /******************************************************************/ void WriteOneChar(unsigned char dat) { unsigned char i=0。 for (i=8。 //稍做延時(shí) DQ = 0。 P2=str[6]。 P2=str[2]。 hours++。//定時(shí)器重裝值 20ms TL0=0xf0。 //顯示 C符號(hào) str[7]=0xff。 TempL=TempL*6/10。 str[6]=dofly[second/10]。 while(1) { function()。//定時(shí)器設(shè)置 TH0=0xef。//讀溫度 void Init_DS18B20(void)。//按鍵 2 sbit key3=P1^2。每個(gè)按鍵 分別標(biāo)號(hào) 為 A,B,C,.第一次按下 B,C 都沒有反應(yīng)， 首先按下 A 鍵可選擇指針位置， B、 C 鍵為加減鍵，可以調(diào)節(jié)數(shù)字時(shí)間大小。同時(shí)單線可掛接多個(gè)元件，因?yàn)槊總€(gè)元件都有唯一的一個(gè) 64 位光 刻 ROM 編碼，家族碼為 28H，可以多個(gè)也可單個(gè)操作。其他三個(gè)內(nèi)部有 30K 的電阻，所以不用再外接電阻。 AT89S52 作為控制核心，具有功耗低，功能強(qiáng)等特點(diǎn)， 電壓可選 3 到 5V 電源供電。 關(guān)鍵詞： ST89S52； DS18B20；溫度檢測；時(shí)鐘 1 設(shè)計(jì)要求 1） 實(shí)時(shí)溫度檢測并顯示。 片內(nèi)含 8Kbbytes 的可反復(fù)檫寫的只讀程序存儲(chǔ)器 （ PEROM） 和 256bytes 的隨機(jī)存取數(shù)據(jù)存儲(chǔ)器（ RAM） ，功能強(qiáng)大，適合許多較為復(fù)雜的控制應(yīng)用
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