1、 中文 3200 字 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 - 1 - Advanced Materials Research Vols. 108-111 (2010) pp 898-902 (2010) Trans Tech Publications, Switzerland doi:10.4028/ Temperature Detecting Syst
2、em of Beer Fermentation Based on DS18B20 Fen-Ping Zhou, Hong-Tao Ma, Bing-Dong Sui， and Jia-Mo Sun College of Information Science & Engineering, Hebei University of Science and Technology Hebei, Shijiazhuang 050054, China , , Keywords: DS18B20, Temperature Detecting, Beer Fermentation, Bus-driving,
3、Fault Detecting 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
4、temperature 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
5、 provides power 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 pro
6、blem of a certain 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, c
7、apability of 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 a
8、re used to ferment 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
9、 traditional temperature detection system is compose of sensor, transmitter, A/D converter and so on. When there exist many detected points, the more - 2 - transmitter and junction wires are needed, which not only makes the cost increase, and also brings us many inconvenience. DALLAS Corp of United
10、States first produced 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 trigg
11、ers TH and TL, 8-bit 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 lase
12、r ROM address code 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 Composit
13、ion of the System The 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
14、 be connected to industrial 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
15、3 bus converter through 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 adop
16、ts the four-core cables；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 connected 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.
