【導讀】的檢測顯得愈發(fā)重要。常用的檢測方法可分為人工檢測方法與自動檢測方法。前者顯然不科學、不。及時，可能對檢測者有一定的危險性。因此，本課題主要采用單片機與無線收發(fā)模塊完成，可實現(xiàn)。溫濕度數(shù)據(jù)的監(jiān)測、顯示、報警等。、處理及遠程控制功能；1月10日─3月20日：查閱資料，完成外文翻譯原文和開題報告。3月21日——4月20日：完成系統(tǒng)的硬件及軟件的基本設計并提交中期檢查報告。4月21日——5月20日：進一步完善系統(tǒng)的硬件及軟件的設計，準備作品驗收。5月21日——6月15日：撰寫、修改畢業(yè)設計論文，準備并完成答辯。STC89C51單片機為該系統(tǒng)的主要控制單元，用C語言編程；采用溫濕傳感器DHT11和無線收發(fā)NRF24L01. 的設置值顯示、實際值顯示；蜂鳴器和二極管完成系統(tǒng)的聲光報警。該系統(tǒng)結(jié)構(gòu)簡單，操作便利，有。很強的實用價值。

　　

【正文】 高了我處理事物的能力。 謹以此致謝最后，我要向百忙之中抽時間對本文進行審閱的各位老師表示衷心的感謝。 陜西理工學院畢業(yè) 設計 第 21 頁 共 48 頁 參考文獻 [1] James S. Control UMicrocontroller[M].Trinity . [2] Edword J. of temperature control system[M].Washington .2020. [3] 朱定華 .微機原理與接口技術(shù) [M].北京 :清華大學出版社，北方交通大學出版社 ,2020. [4] 李斯偉 ,雷新生 .數(shù)據(jù)通信技術(shù) [M].北京 :人民郵電出版社 ,2020. [5] 謝自美 .電子線路設計實驗測試 [M].武漢 :華中科技大學出版社 ,2020. [6] 梁廷貴 .遙控電路可控硅觸發(fā)電路語音電路分冊 [M].北京 :科學技術(shù)文獻出版社 ,2020. [7] 黃賢武 ,鄭筱霞 .傳感器原理及其應用 [M].成都 :電子科技大學出版社 , 2020. [8] 俞國亮 .MCS51單片機原理與應用 [M].北京 :清華大學出版社 ,2020. [9] 夏路易 ,石宗義 .Protell99SE設計教程 [M].北京 :北京希望電子出版社 ,2020. [10]王用倫 .微機控制技術(shù) [M].重慶 :重慶大 學出版社 ,2020. [11]李大寨 .傳感器電子制作 DIY[J].北京 :科學出版社 ,2020. [12]張毅剛 .單片機原理及應用 [M].北京 :高等教育出版社 ,2020. [13]譚浩強 .C 語言程序設計教程 [M].北京 :高等教育出版社 ,2020. [14]彭偉 .單片機 C語言程序設計實訓 100例 [M].北京 :北京航空航天大學出版社， 2020. [15]候殿有 .單片機 C語言設計 [M].北京 :人民郵電出版社 ,2020. [16]姜志海 ,趙艷雷 .單片機的 C 語言 [M].北京 :電子工業(yè)出版社 ,2020. [17]鄭鋒 ,王巧芝 ,程麗平 .51單片機典型應用開發(fā)實例大全 [M].北京 :中國鐵道工業(yè)出版社 ,2020 [18]杜洋 .愛上單片機 [M].北京 :人民郵電出版社 ,2020. 陜西理工學院畢業(yè) 設計 第 22 頁 共 48 頁 附錄 A Ⅰ外文文獻 A Microcontroller based Room Temperature Monitoring System [Abstract] Monitoring the temperature of a puter server room is a critical task to ensure the performance of the server is not disturbed by excessive room temperature. In this paper, we designed and implemented a microcontrollerbased room temperature monitoring system using Atmel ATmega8535 microcontroller and National Semiconductor39。s LM35 temperature sensor. The system is equipped with a Wave GSM modem to send and receive text message (SMS) and relay board to control electronic equipment. The experiment results show that our system works as expected. The system raises an alarm and send an alert message to administrator when the room temperature is above threshold, which is 28176。 C. [Key words] Microcontroller, temperature sensor, server room temperature 1 Introduction Computer server room plays an important role in the IT infrastructure of an anization to support the anization39。s puter work or other ITrelated tasks. Therefore, monitoring the temperature of a puter server room is a critical task to ensure that the performance of the server is not disturbed by excessive room temperature. Generally, the daily puter server room39。s temperature is affected by several factors such as, the server room size, number of server inside the room, and the room39。s air conditioning system. Nevertheless, a system that capable to warn the server administrator regarding the server room temperature will be very useful in case of there is any excessive temperature. This paper presents our design and implementation of a microcontrollerbased system for monitoring server room temperature. We use Atmel AVR ATmega8535 microcontroller and LM35 temperature sensor as the main ponents of the system. Liquid Crystal Display (LCD) and buzzer are used to display the server room temperature and as an alarm, respectively. In order to alert the server administrator, the system is equipped with a GSM modem to immediately send text message if the server room temperature is above a predefined threshold. A relay board is also connected to the microcontroller to control other electronic appliances inside the server room. The remainder of this paper is anized as follows. In Section 2, we provide a short background on microcontroller, specifically the Atmel ATmega8535 microcontroller, and also the LM35 temperature sensor. The design and implementation of the system is described in Section 3. Section 4 provides the General Terms Design, Experimentation 2 Working principle of the system Atmel ATmega8535 ATmega8535 is an 8bit AVR microcontroller. It has a 16 MHz AVR CPU, 8KB Flash, 512 Bytes EEPROM, and 512 Bytes internal SRAM. The other onchip peripherals include two 8bit timers/counters, one 16bit timer/counter, 8channel 10bit analogtodigital (ADC) and 32 programmable I/O lines, PORTA to PORTD, where each port has 8 lines. This microcontroller is available in 40pin PDIP, 44pin TQFP/MLF, and 44pin PLCC packages. Details of ATmega8535 microcontroller are described in [1]. LM35 Temperature Sensor The LM35 is a temperature sensor, whose output voltage is linearly proportional to the Celsius temperature. This sensor has linear output and low output impedance make it easy for connecting it to 陜西理工學院畢業(yè) 設計 第 23 頁 共 48 頁 the readout circuitry [2]. Three pins, +Vs GND, and Vout are defined for the sensor. When used as a basic temperature sensor (2176。 C to 150176。 C), any change in temperature by 1176。 C will be converted to 10 mV or the output voltage (Vout) = 0 mV + 10 mV/176。 C. 3 Related Work Zhu and Bai [3] proposed a system for monitoring the temperature of electric cable interface in power transmission, based on Atmel AT89C51 microcontroller. The system consists of a central PC machine, host control machines, and temperature collectors. Several temperature collectors are connected to a host control machine through RS485 munication work, and the host control machine municates and exchanges data with the central PC machine using General Packet Radio Service (GPRS) connection. The temperature collector itself consists of sensor temperatures (Maxim39。s DS18B20, 1wire digital thermometer), decoders, and other circuits for interfacing purpose. Each temperature collector saves the temperature in SRAM and sent the temperature information back to the host control machine when requested. Each host control machine also stores this temperature data in its memory (SRAM), and send it back to the central PC machine when requested. In this system, the munication using RS485 work is limited by cable length (1200 meters). In [4], Loup et al. developed a Bluetooth embedded system for monitoring server r