課程設(shè)計(jì)-基于單片機(jī)音樂倒數(shù)計(jì)時(shí)器的設(shè)計(jì)-資料下載頁(yè)
2024-11-09 00:06本頁(yè)面
【導(dǎo)讀】倒數(shù)計(jì)數(shù)器，可用來(lái)煮方便面、煮開水或小睡片刻等。小段時(shí)間倒計(jì)數(shù)，當(dāng)?shù)褂?jì)數(shù)為0時(shí)，則發(fā)出一段音樂聲響，通知倒計(jì)數(shù)終了，該做應(yīng)當(dāng)做的事。K4—設(shè)置倒計(jì)數(shù)的時(shí)間為20分鐘，顯示“2020”。c.按操作鍵K4—設(shè)置完成。圖1-1為音樂倒數(shù)計(jì)時(shí)器原理圖，由復(fù)位電路，晶振電路，顯示電路，輸入電路組成，K1，K2，K3為設(shè)置時(shí)間開關(guān)，K4為確認(rèn)開關(guān)，上電LED燈亮，系統(tǒng)等組成，其各組成部分通過(guò)內(nèi)部三總線相連。特殊功能寄存器只能用于存放控制指令數(shù)據(jù)，，程序存儲(chǔ)器用于存放用戶程序和原始數(shù)據(jù)等。P2和P3)，用于單片機(jī)與外部設(shè)備之間的數(shù)據(jù)并行輸入/輸出。與其他具有相應(yīng)接口的設(shè)備之間的異步串行數(shù)據(jù)傳送。對(duì)51系列單片機(jī)來(lái)說(shuō),最小系統(tǒng)一般應(yīng)該包括:單片機(jī)、晶振。使用單片機(jī)片內(nèi)程序存儲(chǔ)器。他是由一個(gè)晶振和兩個(gè)瓷片電容組成的，x1和。相連的那端一定要接地。如果手按著一直不放，系統(tǒng)將一直復(fù)位，不能正常工作。入口，P2口為片選口。
【正文】 in addition to resolutely, have to do, and time. 原來(lái)， 這個(gè)世界上，對(duì)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 person39。s 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 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 selfrighteous 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(dòng)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(guò)自己的怯懦，最終卻發(fā)現(xiàn)有很多 緣分 ，有很多錯(cuò)過(guò)，好像冥冥之中真的已經(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(shuō)，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 the encounter that haven39。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(guò)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(chǎng)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 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。ll be traveling fast, so despite the distance, it will not be like diving into the deep end of a pool. It will be like he is diving into the shallow end. Skydiver preps for the big jump When he jumps, he is expected to reach the speed of sound 690 mph (1,110 kph) in less than 40 seconds. Like hitting the top of the water, he will begin to slow as he approaches the more dense air closer to Earth. But this will not be enough to stop him pletely. If he goes too fast or spins out of control, he has a stabilization parachute that can be deployed to slow him down. His team hopes it39。s not needed. Instead, he plans to deploy his 270squarefoot (25squaremeter) main chute at an altitude of around 5,000 feet (1,524 meters). In order to deploy this chute successfully, he will have to slow to 172 mph (277 kph). He will have a reserve parachute that will open automatically if he loses consciousness at mach speeds. Even if everything goes as planned, it won39。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters). cause there
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