畢業(yè)設(shè)計(jì)基于AT89C51單片機(jī)的籃電子球記分牌設(shè)計(jì)

1、單片機(jī)課程設(shè)計(jì)報(bào)告冊設(shè) 計(jì) 題 目： 籃球賽電子記分牌 專 業(yè)：指 導(dǎo) 教 師：姓 名：學(xué) 號：2012年12月摘 要隨著單片機(jī)在各個(gè)領(lǐng)域的廣泛應(yīng)用，許多用單片機(jī)作控制的計(jì)時(shí)記分系統(tǒng)也應(yīng)運(yùn)而生，如用單片機(jī)控制lcd液晶顯示的計(jì)時(shí)記分器，用單片機(jī)控制led七段顯示的計(jì)時(shí)記分器等?；@球賽電子記分牌是根據(jù)籃球比賽特點(diǎn)設(shè)計(jì)的獨(dú)立的信息采集、分配、評判和顯示的系統(tǒng)，能實(shí)現(xiàn)比賽分?jǐn)?shù)的實(shí)時(shí)、準(zhǔn)確、快捷處理和呈現(xiàn)。本設(shè)計(jì)原理簡單，主要采用at89c51單片機(jī)作為微控制器，集合數(shù)碼管和led指示燈，通過鍵盤控制記分牌的工作狀態(tài)，通過數(shù)碼管和led指示燈來反饋信息的籃球賽記分系統(tǒng)，并仿真實(shí)現(xiàn)。本設(shè)計(jì)在充分考慮了籃

2、球比賽的實(shí)際情況基礎(chǔ)上設(shè)計(jì)，該系統(tǒng)的數(shù)據(jù)顯示由兩個(gè)四位數(shù)碼來實(shí)現(xiàn)，能顯示甲乙兩隊(duì)的比分情況，具有加分、減分、甲乙切換等功能。此外，該系統(tǒng)具有低功耗、可靠性、安全性以及低成本等特點(diǎn)，可廣泛用于學(xué)校和小團(tuán)體作為賽程記分。具有一定的實(shí)用性。關(guān)鍵詞：單片機(jī)，at89c51，led數(shù)碼管，仿真，籃球記分牌目 錄第一章 設(shè)計(jì)任務(wù)與要求11.1 設(shè)計(jì)的目的和意義11.2 設(shè)計(jì)任務(wù)與要求1第二章 總體設(shè)計(jì)方案22.1 顯示模塊22.2 按鍵控制模塊22.3 指示模塊22.4 總體硬件組成框圖2第三章 硬件系統(tǒng)33.1 數(shù)碼管顯示模塊33.2 按鍵控制模塊43.3 led指示燈模塊53.4 單片機(jī)最小系統(tǒng)6第四

3、章 軟件系統(tǒng)74.1 主程序設(shè)計(jì)74.2 指示燈設(shè)計(jì)9第五章 系統(tǒng)調(diào)試與測試105.1 系統(tǒng)調(diào)試105.2 測試結(jié)果11結(jié) 論12參考文獻(xiàn)13附錄一 程序清單14附錄二 仿真全圖17附錄三 元件清單18第一章 設(shè)計(jì)任務(wù)與要求1.1 設(shè)計(jì)的目的和意義目前球場記分牌在傳統(tǒng)操作模式下，采用記分員手動翻動記分牌記分，工作方式單一。由于種種弊端，電子記分板已經(jīng)開始在一些大型的體育場流行起來，不僅發(fā)展速度迅猛并會逐漸取代傳統(tǒng)的電子記分牌。電子記分板根據(jù)籃球比賽的特點(diǎn)，采用單片機(jī)為核心控制led數(shù)碼管，具有亮度高、可視性好、功耗小、使用壽命長等優(yōu)點(diǎn)；具有性能穩(wěn)定，尺寸適中，運(yùn)輸安裝方式靈活，物美價(jià)廉等特點(diǎn)，

4、特別適用于小型籃球體育館和露天運(yùn)動場。1.2 設(shè)計(jì)任務(wù)與要求l 設(shè)計(jì)題目：籃球賽電子記分牌 l 設(shè)計(jì)要求： （1）分別設(shè)計(jì)籃球比賽甲乙兩個(gè)隊(duì)的記分牌；（2）能實(shí)現(xiàn)兩張記分牌的切換；（3）能按照籃球賽記分規(guī)則記分并顯示；（4）將原有的一個(gè)指示燈基礎(chǔ)上進(jìn)一步改進(jìn)為兩個(gè)指示燈，作分別指示。第二章 總體設(shè)計(jì)方案本系統(tǒng)采用單片機(jī)at89c51為控制核心，系統(tǒng)主要包括顯示模塊、按鍵控制模塊、指示模塊等。 2.1 顯示模塊 采用七段碼數(shù)碼管顯示。數(shù)碼管是指將所有發(fā)光二極管的一極接到一起形成公共極，因此數(shù)碼管有共陰共陽之分。以共陽數(shù)碼管為例，共陽數(shù)碼管在應(yīng)用時(shí)應(yīng)將公共極接到+5v，當(dāng)某一字段發(fā)光二極管的陰極為

5、低電平時(shí)，相應(yīng)字段就點(diǎn)亮。當(dāng)某一字段的陰極為高電平時(shí)，相應(yīng)字段就不亮。因此每個(gè)數(shù)碼管有8個(gè)接口。根據(jù)其實(shí)際應(yīng)用進(jìn)行選擇。 2.2 按鍵控制模塊采用獨(dú)立按鍵。每個(gè)獨(dú)立按鍵與單片機(jī)i/o連接，雖然不能節(jié)省i/o口，但電路簡單、編程容易，由于本系統(tǒng)只需要五個(gè)按鍵，因此選者獨(dú)立按鍵。2.3 指示模塊 采用指示燈，在切換記分牌時(shí)起指示作用，能夠看得清楚明白。按鍵控制模塊at89c51數(shù)碼管顯示模塊led指示2.4 總體硬件組成框圖圖2-1第三章 硬件系統(tǒng)為使該電子記分牌更加方便和靈活，本設(shè)計(jì)將其劃分為三個(gè)模塊，下面將對各個(gè)模塊逐一介紹。3.1 數(shù)碼管顯示模塊數(shù)碼管也叫l(wèi)ed數(shù)碼管，它是一種專門用來顯示數(shù)

6、字的器件，led數(shù)碼管（led segment displays）是由多個(gè)發(fā)光二極管封裝在一起組成“8”字型的器件，引線已在內(nèi)部連接完成，只需引出它們的各個(gè)筆劃，公共電極。led數(shù)碼管常用段數(shù)一般為7段有的另加一個(gè)小數(shù)點(diǎn)，還有一種是類似于3位“+1”型。位數(shù)有半位，1，2，3，4，5，6，8，10位等等.，led數(shù)碼管根據(jù)led的接法不同分為共陰和共陽兩類，了解led的這些特性，對編程是很重要的，因?yàn)椴煌愋偷臄?shù)碼管，除了它們的硬件電路有差異外，編程方法也是不同的。圖3-1數(shù)碼管顯示模塊電路3.2 按鍵控制模塊按鍵控制模塊采用4個(gè)獨(dú)立按鍵，ke1、k2、k3、k4、k5分別于單片機(jī)的p10、p

7、11、p12、p13、p17連接，每個(gè)按鍵的另一端直接與地相連接，因此是低電平有效。按鍵控制模塊的電路如圖3-2所示。這四個(gè)獨(dú)立按鍵分別實(shí)現(xiàn)了比賽兩只隊(duì)伍的得分值的改變。具體標(biāo)號和功能如表3-1所示。 表3-1 按鍵功能描述序號接口功能k1p10加1分k2p11加2分k3p12加3分k4p13減1分k5p17甲乙互換圖3-2按鍵控制模塊電路圖3.3 led指示燈模塊led指示燈模塊由兩條電路r1與d1、r2與d2組成，分別接入單片機(jī)的p30、p31口，低電平有效。led指示燈模塊如圖3-3所示。圖3-3led指示燈模塊電路圖3.4 單片機(jī)最小系統(tǒng) at89c51是一種帶4k字節(jié)flash存儲器

8、（fperomflash programmable and erasable read only memory）的低電壓、高性能cmos 8位微處理器，俗稱單片機(jī)。at89c2051是一種帶2k字節(jié)閃存可編程可擦除只讀存儲器的單片機(jī)。單片機(jī)的可擦除只讀存儲器可以反復(fù)擦除1000次。該器件采用atmel高密度非易失存儲器制造技術(shù)制造，與工業(yè)標(biāo)準(zhǔn)的mcs-51指令集和輸出管腳相兼容。圖3-4最小系統(tǒng)模塊電路圖由于將多功能8位cpu和閃爍存儲器組合在單個(gè)芯片中，atmel的at89c51是一種高效微控制器。最小系統(tǒng)模塊的晶振電路由12mhz晶振和30pf的電容構(gòu)成，復(fù)位電路由10uf的電解電容構(gòu)成。

9、電路如圖3-4所示。第四章 軟件系統(tǒng)在本設(shè)計(jì)中，系統(tǒng)的軟件設(shè)計(jì)也采用了模塊化的設(shè)計(jì)，將系統(tǒng)的各部分功能編寫成子模塊的形式。4.1 主程序設(shè)計(jì)本系統(tǒng)中單片機(jī)的主要功能就是利用內(nèi)部的定時(shí)器計(jì)時(shí)，并隨時(shí)接受按鍵控制模塊的信息，將比賽的得分顯示led數(shù)碼管上。k1、k2、k3鍵配合程序所設(shè)定的端口控制比賽的加分，開始時(shí)，當(dāng)k1按下，甲隊(duì)加一分；當(dāng)k2按下，加兩分；當(dāng)k3按下，加三分；k4鍵配合程序所設(shè)定的端口控制比賽的減分，k4按下，減一分。程序流程如圖4-1所示。開始初始化選甲？隊(duì)？yesk1按鍵是否按下？nok2按鍵是否按下？將甲乙隊(duì)分?jǐn)?shù)顯k3按鍵是否按下？no結(jié)束k4按鍵是否按下？no甲加1分y

10、esyes甲加2分yes甲加3分甲減1分k1按鍵是否按下？k2按鍵是否下？k3按鍵是否按下？k4按鍵是否按下？nonono乙加1分yesyes乙加2分yes乙加3分乙減1分nonoyesyes圖4-1主程序流程圖4.2 指示燈設(shè)計(jì)開始運(yùn)行時(shí)，黃燈亮，表示選中了甲隊(duì)記分牌，當(dāng)k5按下，綠燈亮，表示選中了乙隊(duì)記分牌。程序流程如圖4-2所示。yesno開始清零d1亮選中甲隊(duì)k5是否按下？d2亮選中乙隊(duì)顯示結(jié)束圖4-2指示燈設(shè)計(jì)流程圖 第五章 系統(tǒng)調(diào)試與測試5.1 系統(tǒng)調(diào)試 軟件調(diào)試采用keil軟件完成。在打開后，建新工程，選擇at89c51處理器，接著新建文檔編輯程序，編輯完存為.asm，把保存的.

11、asm文件加入到工程里。檢查無語法錯(cuò)誤后生成.hex文件。程序清單查看附錄一。打開仿真軟件isis，找到與系統(tǒng)相關(guān)的元器件，將各個(gè)元器件的引腳連接，保存到程序所在文件夾，將程序加載到at89c51單片機(jī)上，開始運(yùn)行仿真。（1）出現(xiàn)了以下問題，如圖5-1所示。圖5-1（2）發(fā)現(xiàn)問題，如圖5-2所示。圖5-2（3）解決問題后，如圖5-3所示。圖5-35.2 測試結(jié)果 本次系統(tǒng)設(shè)計(jì)結(jié)構(gòu)較好，單片機(jī)最小系統(tǒng)能正常工作，經(jīng)過調(diào)試發(fā)現(xiàn)問題并將問題解決后，按鍵模塊能實(shí)現(xiàn)控制功能，led數(shù)碼管顯示模塊能根據(jù)按鍵模塊輸入的控制信息進(jìn)行顯示，指示燈模塊能按按鍵模塊輸入控制信息和程序設(shè)定的要求顯示。仿真結(jié)果全圖如附

12、錄二所示。 結(jié) 論本次基于單片機(jī)的籃球比賽電子記分牌是針對傳統(tǒng)籃球比賽人工翻動比分牌的改進(jìn)，解決籃球比賽時(shí)計(jì)分與計(jì)時(shí)準(zhǔn)確方便和靈活適用的問題。系統(tǒng)總體電路由單片機(jī)最小系統(tǒng)、led數(shù)碼管顯示模塊、5個(gè)獨(dú)立按鍵控制模塊led指示燈模塊構(gòu)成。四個(gè)模塊分別完成信息的處理、顯示、控制等籃球比賽記分牌的基本功能。通過軟件的仿真調(diào)試，實(shí)現(xiàn)了本次設(shè)計(jì)的基本功能，左邊的數(shù)碼管顯示甲隊(duì)比賽的得分，右邊數(shù)碼管顯示乙隊(duì)比賽的得分。五個(gè)按鍵能完成程序的要求對比分的調(diào)整進(jìn)行控制，指示燈在記分牌切換時(shí)發(fā)生變化，給予球員和觀眾指示。雖然調(diào)試成功，但是該記分牌功能過于單一，只能夠記分，不能滿足現(xiàn)代人們的需求，有待改進(jìn)。為了使一

13、個(gè)系統(tǒng)能夠具備多種功能，以后可以將其進(jìn)一步改進(jìn)，根據(jù)籃球比賽的特點(diǎn)，讓這個(gè)系統(tǒng)能夠記分，也可以計(jì)時(shí)，蜂鳴器在規(guī)定的時(shí)間段鳴叫，給球員和觀眾提示。參考文獻(xiàn)1.單片機(jī)原理與應(yīng)用技術(shù)/江力主編；蔡駿，王艷春，董澤芳副主編.北京：清華大學(xué)出版社，2006（2007重印）2.單片機(jī)課程設(shè)計(jì)指導(dǎo)/樓然苗，李光飛編著./-2版-北京：北京航空航天大學(xué)出版社，2012.1附錄一 程序清單 org 0000h ljmp main org 0030h;*;p0口接數(shù)碼管的段選（低電平有效）;p2.0-p2.3接數(shù)碼管的位選（高電平有效）;*main: mov p2,#0ffh mov p0,#0c0h mov r

14、2,#00 mov r1,#00 clr p3.0;* ;鍵盤掃描程序;*;=判斷甲乙間的轉(zhuǎn)換=chengxu: jb p1.7,jiayidui jnb p1.7,$ cpl p3.0 cpl p3.1jiayidui:jb p3.0,yiduiljmp jiaduijb p3.1,jiadui ljmp yidui;* ;甲 乙隊(duì)加減分判斷;*;=甲隊(duì)加1分程序=jiadui: jb p1.0,loop1 jnb p1.0,$ ljmp jia1;=甲隊(duì)加2分程序=loop1: jb p1.1,loop2 jnb p1.1,$ ljmp jia2;=甲隊(duì)加3分程序=loop2: jb p1

15、.2,loop3 jnb p1.2,$ inc r2 jia2:inc r2jia1:inc r2 cjne r2,#200,lp3 ljmp mainlp3: cjne r2,#201,lp4 ljmp mainlp4: cjne r2,#202,loop3 ljmp main;=甲隊(duì)減1分程序=loop3: jb p1.3,xianshi jnb p1.3,$ dec r2 cjne r2,#0ffh,xianshi ljmp main;=乙隊(duì)加1分程序=yidui: jb p1.0,loop4 jnb p1.0,$ ljmp jia3;=乙隊(duì)加2分程序=loop4: jb p1.1,lo

16、op5 jnb p1.1,$ ljmp jia4;=乙隊(duì)加3分程序=loop5: jb p1.2,loop6 jnb p1.2,$ inc r1 jia4:inc r1jia3:inc r1 cjne r1,#200,lp5 ljmp mainlp5: cjne r1,#201,lp6 ljmp mainlp6: cjne r1,#202,loop6 ljmp main;=乙隊(duì)減1分程序=loop6: jb p1.3,xianshi jnb p1.3,$ dec r1 cjne r2,#0ffh,xianshi ljmp main;* ;顯示程序;*;=甲隊(duì)顯示掃描=xianshi: mov

17、a,r2 mov b,#100 div ab lcall chabiao mov p2,#02h mov p0,a lcall delay mov p2,#00h mov a,b mov b,#10 div ab lcall chabiao mov p2,#04h mov p0,a lcall delay mov p2,#00h mov a,b lcall chabiao mov p2,#08h mov p0,a lcall delay mov p2,#00h;=乙隊(duì)顯示掃描= mov a,r1 mov b,#100 div ab lcall chabiao mov p2,#20h mov p

18、0,a lcall delay mov p2,#00h mov a,b mov b,#10 div ab lcall chabiao mov p2,#40h mov p0,a lcall delay mov p2,#00h mov a,b lcall chabiao mov p2,#80h mov p0,a lcall delay mov p2,#00h ljmp chengxu;跳轉(zhuǎn)到甲乙切換;*;延時(shí)20ms子程序;*delay: mov r5,#10loop: mov r6,#0ffh djnz r6,$ djnz r5,loop ret;*;查表指令;*chabiao: mov dpt

19、r,#0200h movc a,a+dptr ret;*;0-9共陽數(shù)碼管顯示表;* org 0200h db 0c0h,0f9h,0a4h,0b0h,99h db 92h,82h,0f8h,80h,90h end;*;結(jié)束程序;*附錄二 仿真全圖附錄三 元件清單序號名稱位號型號規(guī)格數(shù)量1電阻r1/r21002只2電阻r310k1只3瓷片電容c1/c230uf2只4電解電容c310uf1只5發(fā)光二極管(黃/綠)d1/d22只6npn三極管q1/q2/q3/q4/q5/q6/q7/q890148只7四位數(shù)碼管（紅/藍(lán)）共陽2只8單片機(jī)u1at89c511只9晶振x112mhz1只10單片機(jī)座子1

20、只11輕觸開關(guān)k1/k2/k3/k4/k5/電源開關(guān)四腳6只12導(dǎo)線0.5mm若干13萬用板34*541塊employment tribunals sort out disagreements between employers and employees.you may need to make a claim to an employment tribunal if: you dont agree with the disciplinary action your employer has taken against you your employer dismisses you and

21、you think that you have been dismissed unfairly.for more information about dismissal and unfair dismissal, seedismissal.you can make a claim to an employment tribunal, even if you haventappealedagainst the disciplinary action your employer has taken against you. however, if you win your case, the tr

22、ibunal may reduce any compensation 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 complaining about happened. if your application is received after this tim

23、e 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 organisations listed underfurther help.employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidenc

24、e 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 organisations listed underfurther help.if you are being represented by a solicit

25、or at the tribunal, they may ask you to sign an agreement where you pay their fee out of your compensation if you win the case. this is known as adamages-based agreement. in england and wales, your solicitor cant charge you more than 35% of your compensation if you win the case.if you are thinking a

26、bout signing up for a damages-based agreement, you should make sure youre 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 e-mail, click onneares

27、t cab.for more information about making a claim to an employment tribunal, seeemployment tribunals.the (lack of) air up there watch mcayman islands-based webb, the head of fifas anti-racism taskforce, is in london for the football associations 150th anniversary celebrations and will attend citys pre

28、mier league match at chelsea on sunday.i am going to be at the match tomorrow and i have asked to meet yaya toure, he told bbc sport.for me its about how he felt and i would like to speak to him first to find out what his experience was.uefa hasopened disciplinary proceedings against cskafor the rac

29、ist behaviour of their fans duringcitys 2-1 win.michel platini, president of european footballs governing body, has also ordered an immediate investigation into the referees actions.cska said they were surprised and disappointed by toures complaint. in a statement the russian side added: we found no

30、 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; may be back in the past, to oneself the paranoid weird belief disillusionment, these days, my mind has been very

31、messy, in my mind constantly. always feel oneself should go to do something, or write something. twenty years of life trajectory deeply shallow, suddenly feel something, do it.一字開頭的年齡已經(jīng)到了尾聲?；蛟S是愧疚于自己似乎把轉(zhuǎn)瞬即逝的很多個(gè)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?？傆X得自己自己似乎應(yīng)該去做點(diǎn)什么，或者寫點(diǎn)什么。二十年

32、的人生軌跡深深淺淺，突然就感覺到有些事情，非做不可了。the end of our life, and can meet many things really do?而窮盡我們的一生，又能遇到多少事情是真正地非做不可？during my childhood, think lucky money and new clothes are necessary for new year, but as the advance of the age, will be more and more found that those things are optional; junior high schoo

33、l, 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 isnt really grow up, it seems is not so important; then in high school, think dont want to give vent to out your inner voice can be in the high scho

34、ol children of the feelings in a period, but was eventually infarction when graduation party in the throat, later again stood on the pitch he has sweat profusely, looked at his thrown a basketball hoops, suddenly found himself has already cant remember his appearance.童年時(shí)，覺得壓歲錢和新衣服是過年必備，但是隨著年齡的推進(jìn)，會越來

35、越發(fā)現(xiàn)，那些東西根本就可有可無；初中時(shí)，以為要有一場暗戀才意味著真正的成長，但三年過去后，自己心平氣和的寫同學(xué)錄的時(shí)候，突然就發(fā)現(xiàn)是不是真正的成長了，好像并沒有那么重要了；然后到了高中，覺得非要吐露出自己的心聲才能為高中生涯里的懵懂情愫劃上一個(gè)句點(diǎn)，但畢業(yè)晚會的時(shí)候最終還是被梗塞在了咽喉，后來再次站在他曾經(jīng)揮汗如雨的球場，看著他投過籃球的球框時(shí)，突然間發(fā)現(xiàn)自己已經(jīng)想不起他的容顏。originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, a

36、nd time.原來，這個(gè)世界上，對某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅(jiān)決，還有，時(shí)間。a persons time, your ideas are always special to clear. want, want, line is clear, as if nothing could shake his. also once seemed to be determined to do something, but more often is he backed out at last. dislike his cowardice, finally found that there

37、 are a lot of love, there are a lot of miss, like shadow really have been doomed. those who do, just green years oneself give oneself an arm injection, or is a self-righteous spiritual.一個(gè)人的時(shí)候，自己的想法總是特別地清晰。想要的，不想要的，界限明確，好像沒有什么可以撼動自己。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。嫌惡過自己的怯懦，最終卻發(fā)現(xiàn)有很多緣分，有很多錯(cuò)過，好像冥冥之中真

38、的已經(jīng)注定。那些曾經(jīng)所謂的非做不可，只是青蔥年華里自己給自己注射的一支強(qiáng)心劑，或者說，是自以為是的精神寄托罷了。at the moment, the sky is dark, the air is fresh factor after just rained. suddenly thought of blue plaid shirt; those were broken into various shapes of stationery; from the corner at the beginning of deep friendship; have declared the end of

39、the encounter that havent 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。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場還沒有開始就宣告了終結(jié)的邂逅計(jì)劃那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。baumgartner the disappointing news: mission aborted. r plays an im

40、portant 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 day-to-day wea

41、ther lives. it will climb higher than the tip of mount everest (5.5 miles/8.85 kilometers), drifting even higher than the cruising altitude of commercial airliners (5.6 miles/9.17 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