溫度控制系統(tǒng)的設(shè)計(jì)外文翻譯（中文）-其他專(zhuān)業(yè)-全文預(yù)覽
【正文】 to a wireless one to break the length limit of the 1Wire bus [6]. C. LCD Circuit The LCD 12232F is used, which can be used to show characters, temperature value and time, and supply a friendly display interface. The 12232F is a LCD with 8192 12832 pixels Chinese character database and 128 168 pixels ASCII character set graphics. It mainly consists of row drive/column drive and 12832 full lattice LCD with the function of displaying graphics as well as 2 Chinese characters. It is in a parallel or serial mode to connect to external CPU [7]. In order to economize the hardware resource, the 12232F should be connected to the AT89S51 in serial mode with only 4 output ports used. The LCD grayscale can be changed by adjusting the variable resistor connected the pin Vlcd of the LCD. CLK is used to transmit serial munication clock. SID is used to transmit serial data. CS is used to enable control the LCD. L+ is used to control the LCD backlight power. D. Clock Circuit The Dallas DS1302 is used, which is a high performance, lowpower and realtime clock chip with RAM. The DS1302 serves in the system with calendar clock and is used to monitor the time. The time data is read and processed by the AT89S51 and then displayed by the LCD. Also the time can be adjusted by the keyboard. The DS1302 crystal oscillator is set at 32768Hz, and the remended pensation capacitance is 6pF. The oscillator frequency is lower, so it might be possible not to connect the capacitor, and this would not make a big difference to the time precision. The backup power supply can be connected to a rechargeable battery. E. Keyboard Control Circuit The keyboard interface in the system is driven by the HD7279A which has a +5V single power supply and which is connected to the keyboard and display without using any activedevice. According to the basic requirements and functions of the system, only 6 buttons are needed. The system39。 and automatically control the temperature when the condition temperature exceeds the upper and lower limit value. By doing so it is to keep the temperature unchanged. The system is of high antijamming, high control precision and flexible design。 附件 2：外文原文 Design of the Temperature Control System Based on AT89S51 Dr. Leon Gaillard ABSTRACT The principle and functions of the temperature control system based on microcontroller AT89S51 are studied, and the temperature measurement unit consists of the 1Wire bus digital temperature sensor DS18B20. The system can be expected to detect the preset temperature, display time and save monitoring data. An alarm will be given by system if the temperature exceeds the upper and lower limit value of the temperature which can be set discretionarily and then automatic control is achieved, thus the temperature is achieved monitoring intelligently within a certain range. Basing on principle of the system, it is easy to make a variety of other nonlinear control systems so long as the software design is reasonably changed. The system has been proved to be accurate, reliable and satisfied through field practice. KEYWORDS: AT89S51。當(dāng)溫度之間的上限和下限的值，這是不言而喻的溫度控制處理，即需要的溫度升高或降低根據(jù)預(yù)設(shè)值。例如，當(dāng)系統(tǒng)通電定時(shí)器初始化。全局變量的定義，主要完成對(duì)外部接口連接到單片機(jī) AT89S51芯片，內(nèi)存單位和一些特殊的定義的接口定義。系統(tǒng)流程主要包括以下 8個(gè)步驟： POST（加電自檢），系統(tǒng)啟動(dòng)，溫度檢測(cè)，報(bào)警
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