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he wondered how in the world he came to belong there. Indeed his penning and publishing this essay caused his exmunication from high society and also caused him a lot of legal trouble. The legal trouble came as a result of the fact that he was speaking out against the government. I like to reference such texts from time to time as an example both of the fact that history does repeat itself and that this world is not so big that what applies to one society does not in any way touch another society. On a much smaller scale,Emerson39。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。s Zhangye city during their journey to Kazakhstan, May 5, 2021. The caravan, consisting of more than 100 camels, three horsedrawn carriages and four support vehicles, started the trip from Jingyang county in Shaanxi on Sept 19, 2021. It will pass through Gansu province and Xinjiang Uygur autonomous region, and finally arrive in Almaty, formerly known as AlmaAta, the largest city in Kazakhstan, and Dungan in Zhambyl province. The trip will cover about 15,000 kilometers and take the caravan more than one year to plete. The caravan is expected to return to Jingyang in March 2021. Then they will e back, carrying specialty products from Kazakhstan A small art troupe founded six decades ago has grown into a household name in the Inner Mongolia autonomous region. In the 1950s, Ulan Muqir Art Troupe was created by nine young musicians, who toured remote villages on horses and performed traditional Mongolian music and dances for nomadic families. The 54yearold was born in Tongliao, in eastern Inner Mongolia and joined the troupe in says there are 74 branch troupes across Inner Mongolia and actors give around 100 shows every year to local nomadic people. I can still recall the days when I toured with the troupe in the early 39。 count=0。 writedata1602(39。num16。)。 writedata1602(table2[shi])。 shi3=shi_sx/10。 //按鍵掃描程序 bai=wendu/100。 //取反 led=~led。 //上限大于 95 時,變?yōu)?0 } if(s4==0) delay(50)。 if(s1==0) { if(wen_sx50) wen_sx++。 write1602(0x80)。 e=1。 delayms(1)。y0。 wendu = value_array[2]*10 + value_array[3]/100。 return ERROR。 if(count=NUMBER) { DHT11 = 1。 delay_5us()。 count++ NUMBER) { DHT11 = 1。 if(count=NUMBER) { STATUS = ERROR。 STATUS = OK。 _nop_()。 sbit s3=P1^3。 /*各個變量定義 */ uchar count,shidu_xiaoshu,wendu_xiaoshu。 //溫度上限 uint shi_sx=0。在畢業(yè)設計的過程中,王老師定期檢查督促我們的畢業(yè)設計,幫我們解決遇到的問題。由于電路設計比較簡單,所以并沒有涉及 PCB板,直接手動焊接完成電路。 圖 晶振電路 3. 3 顯示電路 在日常生活中,我們對液晶顯示器并不陌生,它已作為很多電子產品的通過器件,比方在計算器、萬用表、電子表及很多家用電子產品中都可以看到,顯示的主要是數字、專用符號和圖形。如圖 所示。這樣一來就組成某個字符。液晶顯示器具有厚度薄、 適用于大規(guī)模集成電路直接驅動、易于實現全彩色顯示的特點,目前已經被廣泛應用在便攜式電腦、數字攝像機、 PDA移動通信工具等眾多領域。 2℃,工作電壓 3. 0~ 5. 5 V,相應時間 5S, DHT1l 采用 4 針單排引腳封裝 , 傳感器通電后,需要等待 1s,這是因為要越過不穩(wěn)定的狀態(tài),在此期間不需發(fā)送指令 ,電源引腳( VDD, GND)之間可增加一個 100nF 的電容,用以去耦濾波 [7]。在單芯片上,擁有靈巧的 8 位 CPU 和在 系統(tǒng)可編程 Flash,使得 STC89C52 為眾多嵌入式控制應用系統(tǒng)提供高靈活、超有效的解決方案。并且能夠智能報警從而采取相應措施。 環(huán)境控制也就成了人們安居樂業(yè)的基礎,成了共建和諧環(huán)境的重要環(huán)節(jié)。本設計主要包括硬件電路的設計和系統(tǒng)軟件的設計。 關鍵詞 :溫度測量; 濕度測量; STC89C52; DHT11 Abstract This design is the use of MSC51 Series MCU STC89C52 and DHT11 in the lowcost temperature and humidity detection system. This design includes the design of hardware and system software design. Hardware circuit includes a microcontroller, temperature and humidity sensors, display module, the alarm and the keyboard 5, the DHT11 temperature and humidity sensor and 1602 constitute a system of character LCD module display module, the system circuit is simple, stable, high integration, missioning Convenient, high precision, has some practical value. Temperature and humidity control circuit in which the temperature and humidity sensors and pare the value of the preset temperature alarm circuit, the user input required predefault value, when the actual temperature and humidity measurements of temperature and humidity is greater than the preset value, an alarm signal (bee Buzzer beep). Software part includes the main program, display routines, subroutines side temperature and humidity。因此,具有廣闊的應用前景和用途。蜂鳴器電路就是用三極管來實現的,用來判斷周 圍的溫度或者濕度是否超出設定數值,顯示電路主要用來顯示當前的溫濕度。最高運作頻率 35MHz, 6T/12T 可選。 DHT11發(fā)送響應信號的時候總線為低電平 ,DHT11把總線拉高 80us之前 ,必須等到響應信號發(fā)送,準備發(fā)送數據時 ,每一 bit數據都以 50us低電平時隙開始 ,數據位是 0或 1是由高電平的長或短來決定。例如屏的第一行的亮暗由 RAM 區(qū)的 000H—— 00FH 的 16字節(jié)的內容決定,當( 000H) =FFH 時,則屏幕的左上角顯示一條短亮線,長度為 8個點;當( 3FFH) =FFH 時,則屏幕的右下角顯示一條短亮線;當( 000H) =FFH,( 001H)=00H,( 002H) =00H,??( 00EH) =00H,( 00FH) =00H 時,則在屏幕的頂部顯示一條由 8段亮線和 8條暗線組成的虛 線。一般 1602 字符型液晶顯示器實物如圖 所示: 圖 1602字符型液晶顯示器實物圖 1602LCD 的基本參數及引腳功能 1602LCD 分為帶背光和不帶背光兩種,基控制器大部分為 HD44780,帶背光的比不帶背光的厚,是否帶背光在應用中并無差別,兩者尺寸差別如圖 : 圖 1602LCD 尺寸圖 圖 1602 基本參數 1602LCD 主要技術參數: 顯示容量: 16 2個字符 芯片工作電壓: — 工作電流: ( ) 模塊最佳工作電壓: 字符尺寸: ( W H) mm 顯示部分采用 SMC 1602 液晶屏進行數據顯示,其主要技術參為:表 1 所示。晶振通常與鎖相環(huán)電路配合使用,以提供系統(tǒng)所需的時鐘頻率,可以用于同一個晶 振項鏈的不同鎖相環(huán)來提供的。設計初對于單片機的應用并不是很了解,本科學習中初步接觸過 C語言,由于本次設計需要硬件和軟件兩部分,因此我是從軟件部分先開始的,然后才開始硬件電路的設計,但是由于軟件 的不完美影響了硬件電路設計的不是很美觀。 致 謝 四年的大學生活接近尾聲,我的畢業(yè)設計也順利的完成了,這里首先向我的指導老師王丹老師表示最誠摯的感謝,同時也感謝那些幫助過我的同學們。 typedef unsigned int uint。//濕度 uchar code table2[]={0123456789}。 sbit DHT11=P1^7。 16 _nop_()。j120。 while(DHT11 == 0 amp。 if(DHT11 != 0) { value ++。 DHT11 = 0。 } while(DHT11 == 0 amp。amp。 return ERROR。 for(x=z。 //rs 為一時寫數據 delayms(1)。 rs=0。 write1602(0x38)。 ET0=1。 //當減小到零時,為 50 } if(s3==0) delay(50)。 //led燈亮 num++。