【正文】 . The Huachen Auctions also set a special session of photographs under the condition of large scale decline of auction sessions. There was a palpable dull thud of disappointment that acpanied the return of the imperial entourage of Zhen Huan to her homeland. It followed a couple years of hushed excitement as Chinese fans were fed tidbits about their proud concubine who was supposed to conquer the high ground of the North American market. 基于單片機的智能電風扇控制系統(tǒng) 20 Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2020 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modification. Now, a condensed version that provides English subtitles but no dubbing has finally been made available on Netflix for online streaming. This version, highly anticipated as a milestone in China39。進一步實現(xiàn)了降低工作成本提高工作效率，響應了國家所提倡的節(jié)能減排口號。由式可知 ,當 U , I , N 為定值時 ,只要改變 n值的大小即可控制功率的輸出 ,從而達到調(diào)節(jié)電機轉(zhuǎn)速的目的。電路圖如下所示。 Temperature control。 Automatic shift。整個系統(tǒng)力求結(jié)構(gòu)簡單，功能完善。I 為可控硅在一個電源周期全導通時所對應的電流有效值 A。 我們通過用 MCS51單片機為核心，通過溫度傳感器對環(huán)境溫度進行數(shù)據(jù)采集，從而建立一個完善的控制系統(tǒng)，實現(xiàn)電風扇隨空氣中溫度變化而自動變換檔位，可以再一定 范圍內(nèi)設置電風扇的最低工作溫度，當溫度低于所設置溫度時，電風扇將自動關(guān)閉，當高于此溫度時電風扇又將重新啟動的系統(tǒng)。s president, who is also a renowned tenor, tells China Daily. During a tour in 1985, he went to a village and met an elderly local man, who told him a story about his friendship with a solider from Shenyang, capital of Northeast China39。 names and figuring out what to do with them for the brief time each week that I stand in front of them. I do not consider the challenges of learning to live here part of a purposeful life. I consider those issues existential in nature. One of the problems with my life in America was that I felt it had no purpose. I went to work every day and even did what I could to make my colleagues39。t just about sharing art with nomadic families but also about gaining inspiration for the music and dance. Ulan Muqir literally translates as red burgeon, and today39。 2）斷服務程序，執(zhí)行中 斷服務程序時，首先保護現(xiàn)場， INT0中 斷標志置位，禁止主程序修改工作參數(shù)，然后開始減 1計數(shù)，判斷是否關(guān)斷可控硅，最后 INT0中斷 標志位清零，還 原初 始化數(shù)據(jù)，恢復現(xiàn)場，中斷返回。所設計的可控硅觸發(fā)電路原理圖， 其中 RL即為電機負載，其工作原理是 :單片機響應用戶的參數(shù)設置 ,在 I/ O 口輸出一個高電平 ,經(jīng)反向器反向后 ,送出一個低電平 ,使 光 電 耦 合 器 導 通 ,同 時 觸 發(fā) 雙 向 可 控 硅 ,使工作電路導通工作。是比較合適的方案。通過鍵盤手動設定，可以在一定范圍內(nèi)設置電風扇的最低工作溫度，當溫度低于所設置溫度時，電風扇將 自動關(guān)閉，當高于此溫度時電風扇又將重新啟動系統(tǒng)。 本設計主要內(nèi)容如下： 風速設為從高到低 5個檔位，可由用戶通過鍵盤手動設定。通過控制雙向可控硅的導通角，使輸出端電壓發(fā)生改變，從而使施加在電風扇的輸入電壓發(fā)生改變，以調(diào)節(jié)風扇的轉(zhuǎn)速，實現(xiàn)各檔位風速的無級調(diào)速。單片機所用的系統(tǒng)頻率為 12MHz。雖然只有短短的三年，但是在學校卻讓我感受到了家的溫暖，讓我對人生進一步有了明確的目標。s essay titled SelfReliance. If you39。s own path. He urges the reader to find rectitude and lead a moral life. He professes that, only by being self reliant, as opposed to relying on the government and being dictated to by society, can one begin leading a decent and purposeful life. He avers that such a life is the only life worth living. I agree with him. This essay was written during a time of social upheaval in America, and it is rather odd that Emerson authored it, as he was a part of the upper crust of society at the time. It just so happened that he looked around him, at the indolence and the wantonness of the people in his circle。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。 DS18B20芯片功能命令表 基于單片機的智能電風扇控制系統(tǒng) 10 主要程序如下： MAIN: ；初始化 LCALL RST_DS18B20 LCALL GET_TEMPER MOV A,20H MOV C,08H RRC A MOV C,09H RRC A MOV C,10H RRC A MOV C,11H RRC A MOV 20H,A LCALL DISPLAY AJMPMAIN RST_DS18B20: SETB P3. 7 NOP CLR P3. 7 MOV R1, 3 RST1:MOV R0, 110 DJNZ R0, $ DJNZ R1,RST1 SETB P3. 7 NOP NOP MOV R0, 25H RST2:JNB P3. 7,RST3 基于單片機的智能電風扇控制系統(tǒng) 11 DJNZ R0,RST2 LJMP RST4 RST3: SETB FLAG LJMP RST5 RST4:CLR FLAG LJMP RST7 RST5:MOV R0, 115 RST6:DJNZ R0, $ RST7: SETB P3. 7 RET WR_DS18B20: ；寫數(shù)據(jù)子程序 MOV R2, 8 CLR C WR1: CLR P3. 7 MOV R3, 6 DJNZ R3, $ RRC A MOV P3. 7,C MOV R3, 25 DJNZ R3, $ SETB P3. 7 NOP DJNZ R2,WR1 SETB P3. 7 RET RD_DS18B20: ；讀數(shù)據(jù)子程序 MOV R4, 2 MOV R1, 20H READ1: 基于單片機的智能電風扇控制系統(tǒng) 12 MOV R2, 8 READ2: CLR C SETB P3. 7 NOP NOP CLR P3. 7 NOP NOP NOP SETB P3. 7 MOV R3, 9 READ3: DJNZ R3,READ3 MOV C, P3. 7 MOV R3, 23 READ4: DJNZ R3,READ4 RRC A DJNZ R2,READ2 MOV R1,A INC R1 DJNZ R4,READ1 RET 基于單片機的智能電風扇控制系統(tǒng) 13 電機調(diào)速與控制模塊程序流程 程序設計原理 采用雙向可控硅過零觸發(fā)方式，由單片機控制雙向可控硅的通斷，通過改變每個