畢業(yè)設(shè)計(jì)-基于單片機(jī)的智能電風(fēng)扇控制系統(tǒng)設(shè)計(jì)-資料下載頁(yè)
2025-11-21 18:53本頁(yè)面
【導(dǎo)讀】盡管電風(fēng)扇有其市場(chǎng)優(yōu)勢(shì)，但傳統(tǒng)電風(fēng)扇還是有許多地方應(yīng)當(dāng)進(jìn)行改良的，最突出的缺點(diǎn)是它不能根據(jù)溫度的變化適時(shí)調(diào)節(jié)風(fēng)力大小，對(duì)于夜間溫差大的地區(qū)，人們?cè)谙囊故褂秒婏L(fēng)扇時(shí)可能遇到這樣的問(wèn)題：當(dāng)凌晨降溫的時(shí)候電風(fēng)扇依然在工作，可是人們因?yàn)槭焖鵁o(wú)法察覺(jué)，既浪費(fèi)電資源又容易引起感冒，傳統(tǒng)的機(jī)械定時(shí)器雖然能夠控制電風(fēng)扇在工作一定后關(guān)閉，但定時(shí)范圍有限，且無(wú)法對(duì)溫度變化靈活處理。②當(dāng)溫度每降低2℃則電風(fēng)扇風(fēng)速自動(dòng)下降一個(gè)檔位。本模塊以DS18B20作為溫度傳感器，AT89C51作為處理器，配以溫度顯示作為溫度控制輸出單元。DS18B20進(jìn)行現(xiàn)場(chǎng)溫度測(cè)量，，經(jīng)過(guò)單片機(jī)處理后顯示溫度值，并與設(shè)定溫度值的上下限值比較，若高于設(shè)定上限值或低于設(shè)定下限值則控制電機(jī)轉(zhuǎn)速進(jìn)行調(diào)整。DS18B20直接將測(cè)量溫度值轉(zhuǎn)化為數(shù)字量提交給單片機(jī)，工作時(shí)必須嚴(yán)格遵守單總線(xiàn)器件的工作時(shí)序。
【正文】 ecial 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(méi)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(méi)有開(kāi)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 jumpWhen 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 there21
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