基于DS18B20的啤酒发酵温度测控系统毕业设计外文资料翻译.doc
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1、毕业设计外文资料翻译题 目 基于DS18B20的啤酒发酵 温度测控系统 学 院 自动化与电气工程学院 专 业 自动化 班 级 自动化xxxx班 学 生 xxxxxxxxx 学 号 20100321166 指导教师 xxxxx 二一四年三月三十一日Advanced Materials Research Vols. 108-111 (2010) pp 898-902 (2010) Trans Tech Publications, Switzerlanddoi:10.4028/Temperature Detecting System of Beer FermentationBased on DS18
2、B20Fen-Ping Zhou, Hong-Tao Ma, Bing-Dong Sui,and Jia-Mo SunCollege of Information Science & Engineering, Hebei University of Science and TechnologyHebei, Shijiazhuang 050054, Chinazhoufenping,mahongtaosuibd,sunjiamoKeywords: DS18B20, Temperature Detecting, Beer Fermentation, Bus-driving, Fault Detec
3、ting Abstract. This Paper introduces a temperature detection system in beer fermentation. A temperature monitoring system with characteristics of bus topology structure is composed of industrial computer, temperature detector, bus converter, transmission bus and especially 1-wire digital temperature
4、 sensor DS18B20. Four-core cable is used to form a tree-like or star-like network, in which 54 digital temperature sensors existing on 18 fermentation tanks can be connected.The quantity of junction wires between temperature sensor and computer will be reduced greatly.Temperature detector provides p
5、ower supply for bus converter and DS18B20 through Four-core cable. Because bus converter has used hardware fault detecting technology, the fault temperature sensor can automatically detach from the main bus and will not affect normal working of other sensor in network. So to solve the problem of a c
6、ertain sensor or branchs damage causing the paralysis of entire bus. The length of detecting temperature bus can reach more than 500 meters. These all make system maintenance and expansion easy. The experiments show that this system is characterized by high intelligence, high-precision, capability o
7、f making temperature test on multi-points and compensating function. The method has a good applicable value to the temperature test.Introduction The change of fermentation temperature has a greater impact on the quality of beer in the process of beer production. Many fermentation tanks are used to f
8、erment beer in a brewery. A few sensors are installed in each fermentation tank to measure the temperature of liquid. The temperature monitoring system is characterized by greater number of temperature measurement points, the temperature measurement points are relatively concentrated.The traditional
9、 temperature detection system is composeof sensor, transmitter, A/D converter and so on. When there exist many detected points, the more transmitter and junction wires are needed, which not only makes the cost increase, and also brings us many inconvenience. DALLAS Corp of United States first produc
10、ed 1-wire digital temperature sensor DS1820, and then an enhanced product DS18B20 is released. The DS18B20 is a kind of digital temperature sensor of high integration, which consists of 64-bit laser ROM, temperature sensor, 1-wire interface, scratchpad RAM, temperature alarm triggers TH and TL, 8-bi
11、t CRC generator, control logic and parasitic power 1. The measuring temperatures of DS18B20 is range from -55C to +125C, which precision is 0.5C and resolution is programmable from 9 to 12 bits. It adopts 3-pin (GND, DQ, VDD), TO-92 package. Each DS18B20 has the unique 64-bit laser ROM address code
12、1. A lot of DS18B20 can be connected to the same bus to detect the temperature without any external components. This feature is very well suitable for multi-point distributed temperature detection, and is convenient to constitute bus-type temperature detection system.The Composition of the System Th
13、e composition of temperature monitoring system of Beer fermentation is shown in Figure 1. Industrial Computer is responsible for the work of displaying temperature data, generating the curve of temperature change, and temperature chart printing and so on. Temperature detector can be connected to ind
14、ustrial computers through the RS-232 interface. It controls the working condition of all the temperature sensors through transmission bus, and collects temperature data of 18 fermentation tanks in accordance with industrial computer commands. Temperature Detector is connected to 3 bus converter thro
15、ugh the transmission bus, each bus converter can be connected to 6 fermentation tanks; there are 3 temperature sensors (DS18B20) in each fermentation tank. The temperature monitoring system contains 54 temperature measurement points in 18 fermentation tanks. Transmission bus adopts the four-core cab
16、les;Temperature detector provides power supply for bus converter and DS18B20 through transmission bus. There is a bus driver in temperature detector; it can drive more than 500 meters transmission bus. If you need increase the number of temperature measurement points, more bus converters can be conn
17、ected to transmission bus in order to achieve linking of more DS18B20s. The number of the DS18B20 can be connected up to more than 300 at most.The Design of Temperature Detector The composition of the temperature detector is shown in Figure 2, AT89C51 microcontroller is the core of the temperature d
18、etector to control the work of the various circuits. Control program is stored in the MCUs internal program memory. Data memory saves the temperature data of each detection point. 64-bit code memory saves laser ROM code of each temperature sensor (DS18B20). MCUs serial signals are converted to RS-23
19、2C standard through RS-232 interface to realize the connection of industrial computer and the temperature detector. Bus driver extends the driving capability of MCUs I/O port to drive the transmission bus, in order to obtain further transmission distance. Watchdog and reset circuit can provide power
20、-on reset for the microcontroller, they can also provide reset signal when program has been confused by accidentally interfering. Display is used to show the current number of fermentation tanks and temperature value of 3 sensors in fermentation tanks. The keyboard is used to control the temperature
21、 detector starting and stopping, but also enter the testing cycle and other control parameter.Temperature detector can work independently, and display the number of fermentation tank and temperature value of 3 detected points in this tank, the range of temperature shown is -19.9C 99.9C. The number o
22、f tank shown can automatically change in cycle. Time shown can be set arbitrarily during 199 seconds. Temperature detector is also able to accept orders of industrial computer, it transmits the temperature value to the industrial computer, and then the industrial computer completes data processing.
23、The Design of Bus Driver and Bus Converter Theoretically, lots of DS18B20s can be connected to one bus in parallel. However, the operating time slot of DS18B20 is fixed, and the width of many control impulses is so narrow that it is only few microseconds. In fact, we can seldom meet the need of the
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