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23 MOV R3, 08H NEXT: RLC AMOV R2, A MOV A, 30H ADDC A, 30H DA A MOV 30H, A MOV A, 31H ADDC A, 31H DA A MOV 31H, A MOV A, R2 DJNZ R3, NEXT L2: MOV A, 30HADD A, 30H DA A MOV 30H, A MOV A, 31H ADDC A, 31H DA A MOV 31H, A RET 24 KEYIN: JB , $MOV A, P3 ANL A, 0FH MOV DPTR, TABLE MOVC A, A+DPTR XRL A, 0AH JNZ START0 JB , KEYIN1 MOV R1, 32H CALL DISP MOV R5, 4FH D4: MOV R7, 0FFHD3: MOV R6, 0FFHD2: JB , KEYIN1DJNZ R6, D2 DJNZ R7, D3 DJNZ R5, D4 JMP START0 KEYIN1: JB , $MOV A, P3 ANL A, 0FH MOV DPTR, TABLE MOVC A, A+DPTR 25 MOV 20H, A XRL A, 0AH JZ X1 MOV A, 20H XRL A, 0BH JZ WAIT1 MOV A, 20H XCH A, 32H XCH A, 33H WAIT1: MOV R1, 32HCALL DISP JB , KEYIN1 JMP WAIT1 X1: JMP START0DISP: MOV A, R1ANL A, 0F0H SWAP A MOV 38H, A INC R1 MOV A, R1 ANL A, 0FH SWAP A ORL A, 38H 26 MOV P1, A CALL DELAY RET TIM0: PUSH ACCPUSH PSW MOV TH0, 60 MOV TL0, 76 MOV A, 33H CJNE A, 31H, T MOV A, 32H CJNE A, 30H, T JMP OFF T: JC OFFCLR RETURN: POP PSWPOP ACC RETI OFF: SETB RETURN DELAY: MOV R7, 06D1: MOV R6, 248DJNZ R6, $ DJNZ R7, D1 RET TABLE: 27 DB 01H, 02H, 03H, 0FFHDB 04H, 05H, 06H, 0FFH DB 07H, 08H, 09H, 0FFH DB 0AH, 00H, 0BH, 0FFH TABLE1 : DB 4BHDB 32H END 28 您好,為你提供優(yōu)秀的畢業(yè)論文參考資料,請(qǐng)您刪除以下內(nèi)容, O(∩_∩)O 謝謝?。?!A national survey was recently launched to evaluate the eye health of Chinese children n June 6, China39。s health. Poor technique harms the muscles and skeleton, and can cause secondary injures. And, jogging in a bad environment can cause circulation problems, said Lu Zhiyong, attending doctor, Sports Hospital, General Admin. of . Lu has some tips for joggers, and those who are thinking of taking it says people should first evaluate their physical condition, to decide the amount and type of exercise, and jogging in the open air is better running on a treadmill. Conrad Macao will run special programs for the entire month of October this year to support the Hong Kong Cancer Fund39。s longtime executive chef embraces mapo tofu and other exotic elements for the burgerdriven menu, Liu Zhihua the age of 37, Shanghai native Lin Zhengu has bee a star as a Western cuisine chef in the Chinese metropolis, a city that has a wealth of Western restaurants. The executive chef of Blue Frog Bar and Grill, a popular burgerbased restaurant and bar chain on the Chinese mainland, Lin is the soul of the restaurant franchise39。s juicy, tender texture and its delicious beef flavor. Matching that Sichuan flavor with cheese created a new taste experience. 。s Guangzhou city anized the Chengdu festival. A terrifying wooden bridge in China has just been replaced by a glass one. This, the world’s longest glassbottomed walkway, is located in Shiniuzhai Geopark in Hunan, and spans 300m (984f) and is 180m (590f) above ground. The floor is made of doublelayered glass that is 24mm (), and is reportedly 25 times stronger than regular window glass. The bridge had previously been made of wood, linking the two peaks of Stone Buddha Mountain, but 11 engineers working 12 hours a day converted it to glass. Previously, you were considered brave if you steeled yourself to cross the wooden walkway。ll hold off jogging for a while. But if I really want to get away from work, I39。 在完成本文的過程中,查詢了很大一批資料,對(duì)于整理這些資料的各位學(xué)者,雖然不知道你們是誰(shuí),但我依舊感謝你們?yōu)檫@個(gè)方面的知識(shí)所做出的貢獻(xiàn),我深表欣慰。本文主要是側(cè)重于軟件的應(yīng)用,在硬件方面,主要做的工作只是理論,不能完善,對(duì)此深表遺憾。因?yàn)闇囟瘸^預(yù)定值而需要降低室內(nèi)溫度時(shí)侯,此時(shí)單片機(jī) AT89C51 就會(huì)控制端口,使其置為 1(高電平狀態(tài)),以此控制降溫風(fēng)扇或者其他降溫措施來降低室內(nèi)溫度。 鍵盤電路掃描原理是將鍵盤的按鍵都接在一個(gè) 集成電路 IC74922 的芯片上,當(dāng)電源通電的時(shí)侯,假如在鍵盤上有按鍵按下觸動(dòng)時(shí)侯,此芯片就會(huì)產(chǎn)生一個(gè)微弱信號(hào)并且會(huì)經(jīng)由 IC74922 的四個(gè)端口 A、 B、 C、 D 將此信號(hào)傳遞給單片機(jī) AT89C51處理。 LED 顯示系統(tǒng) 本顯示系統(tǒng)譯碼器 IC 和溫度顯示電路的主要工作原理如下圖 25 所示: 圖 25 顯示系統(tǒng)譯碼器 IC 和溫度顯示電路原理圖 上圖所示的顯示器元件的工作原理是:它將溫度轉(zhuǎn)化而成的數(shù)字量,也就是測(cè)得的溫度值,通過單片機(jī) AT89 C51 的 P1 端口而且經(jīng)過兩個(gè)編譯碼 IC 輸出并且發(fā)送到分為兩個(gè)七段數(shù)碼管顯示,這兩個(gè) LED 都是共陽(yáng)極的。 OPA3: 放大 5 倍并反相。對(duì)于上電復(fù)位操作,要在復(fù)位電路的引腳上串接了一個(gè)電容。我們要控制的溫度在這個(gè)室內(nèi)應(yīng)該是保持在10 攝氏度 —— 40 攝氏度之間,并且在這個(gè)區(qū)域內(nèi)的溫度值是可以自由設(shè)定的。溫室內(nèi)的溫度控制部分,運(yùn)用了 PID 回路的負(fù)反饋控制,以此在控制系統(tǒng)中,由溫度傳感器DS18B20 檢測(cè)溫室內(nèi)的 溫度,并且采用中值濾波的方法取一個(gè)適當(dāng)?shù)臄?shù)值植入程序存取器,當(dāng)做內(nèi)部一個(gè)單元的最后檢測(cè)信號(hào),并在 LED 顯示器中顯示。只是目前還不能廣泛應(yīng)用,特別是應(yīng)用到普通農(nóng)業(yè)生產(chǎn),當(dāng)然有很多的外部因素,不過自身也存在著不少的問題,像技術(shù)問題,因?yàn)橹悄芑枰邔W(xué)歷知識(shí)層面的技術(shù)員操作,而現(xiàn)在我們面對(duì)的情況是文化程度中低偏下的勞動(dòng)者,有很多的技術(shù)問題無法面向他們。所以,目前市場(chǎng)上最流行的趨勢(shì)就是自動(dòng)化控制系統(tǒng),當(dāng)然,在現(xiàn)代化社會(huì)建設(shè)的過程中,最終,智能化科技終究會(huì)成為主流,替代現(xiàn)在的自動(dòng)化技術(shù)。除此以外,還能夠準(zhǔn)確定時(shí)定量,高效地進(jìn)行溫室環(huán)境控制,提高產(chǎn)品質(zhì)量和產(chǎn)量。 傳統(tǒng)農(nóng)業(yè)基本聽天由命,靠天氣的變換來決定作物生長(zhǎng)的環(huán)境,決定作物生長(zhǎng)的狀況。 本科畢業(yè)論文(設(shè)計(jì)) 題 目 溫室自動(dòng)化控制系統(tǒng) 指導(dǎo)老師 職稱 學(xué)生姓名 學(xué)號(hào) 專 業(yè) 班級(jí) 1 班 院 (系 ) 完成時(shí)間 2022 年 4 月 20 日 I 基于 AT89C51 單片機(jī) 控制 的 溫室自動(dòng)化控制系統(tǒng) 設(shè)計(jì) 摘 要 本系統(tǒng)把單片機(jī)作為主要控制核心,并且利用溫度傳感器對(duì)溫室的溫度進(jìn)行實(shí)時(shí)采集和控制,以此實(shí)現(xiàn)溫室溫度的自動(dòng)化控制。 otherwise, open cooling measures, in order to achieve cooling effect. Through the system, effective, reliable detection and control of the temperature in the greenhouse, so as to ensure the greenhouse crop production at the optimum temperature, improve yield and quality. KEYWORDS AT89C51 microcontroller, Proteus, DS18B20 sensor, greenhouse, temperature measurement and control III 目 錄 中文摘要 ................................................................. .Ⅰ 英文摘要 .................................................................. Ⅱ 1. 引言 .................................................................... 1 溫室自動(dòng)化控制技術(shù)的發(fā)展概況 ................................. 2 國(guó)內(nèi)發(fā)展趨勢(shì)及方向 .............................