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1、电气工程与自动化学院本科毕业设计专业翻译资料（中文读书报告）学生姓名： 王 超 杰 专业班级： 自动化12-06班 学 号： 311208002219 2016 年 6 月 11 日原文：Design of Combustible Gas Detection system using WirelessTransmission TechnologyShijiazhuang Universities of Economics, Hebei, ChinaKeywords:TGS813, AT89S52, DS18B20, nRF905, TC35iAbstract.The detection dev
2、ice of combustible gas are designed in the presented work,using wireless transceiver and GSM network.The system realize the wireless transmission of the gas concentration,and also can send alarm information to users mobile when an exception occurs. The system consists of two parts: a master and slav
3、e. The function of the slave is to collect data, process data and transffer the data to the master.The taskof the master is to receive data and display it by LED.The signal acquisition is completed by sensor TGS813 and A/D converter TLC2543. The wireless transmission is achieved through wireless tra
4、nsceiver nRF905. Since the accuracy of the sensor is affected by the environment,using DS18B20 to achieve temperature compensation. And with wireless communication module TC35i and GSM network platform, we can send the alarm information to users mobile promptly.IntroductionGas detection is widely us
5、ed in petroleum, chemical, metallurgy, family, shopping malls, gas stations and other places. Currently, how to monitor the hazardous gas fast and accurately are the important issues. Although the gas detection technology is relatively mature, but most products has many shortcomings, such as single
6、function, operating complex, bulky, expensive and low sensitivity. Wireless communication technology applied to the gas monitoring field, can resolve the problem of remote monitoring in special environment, such as high temperature, low temperature, toxic gas.and unable to wiring .In the presented w
7、ork, the combustible gas detectoris fully functional (with wireless transceiver), simple, small size, low cost, and has high sensitivity. The equipment can greatly improve the systems detection capability and accuracy with temperature compensation algorithm, and also can send alarm information to th
8、e users mobile phone promptly through the GSM network.System design The system consists of two parts as shown in Figure 1.Fig. 1 Overall system block diagramThe slave part mainly complete data collection and wireless transmission. The master part mainly complete receiving data, displaying and sendin
9、g alarm message.The signal of gas concentration is collected by combustible gas sensor which generates a weak electrical signal. The signal can be amplified and stabilized by conditioning circuit. And then A/D circuit converts the analog signal to digital signal which microcontroller can process. In
10、 order to improve the measurement accuracy, and reduce the impact of temperature, design a temperature compensation circuit to collect tempreture data. AT89S52 process the collected data and send data to the master by wireless transceiver.The master receives the data and displays it by LED. And if t
11、he gas concentration being abnormal,the system will drive speaker for an alarm signal and use TC35i module to send alarm information to users mobile.Hardware designSignal acquisition and conditioning circuit. Figure 2 shows data acquisition circuit. TGS813 is a Gas sensing resistive sensor. The cond
12、uctivity of TGS813 is influenced by the concentration of combustible gases in air, the greater the concentration, the higher conductivity. In system R0, R9, R10 and RS (in TGS813) form a bridge circuit to convert resistance to voltage signal. Operational amplifier A connected as a voltage follower w
13、ith resistors R7 and regulator D1 make up the voltage regulator circuit to supply power for the bridge. In order to the voltage adapt to the A/D converter, the voltage is amplified by opamp B, and the magnification can be adjusted through resistor R11.Fig. 2 Gas concentration signal acquisition circ
14、uitFig. 3 Temperature compensation circuitTemperature compensation circuit. The resistance of Rs is greatly affected by temperature. In order to improve system accuracy, the results must be temperature compensated or temperature correction.In system, using temperature sensor DS1820 to collect temper
15、ature signal, and using software method for temperature correction.Wireless transmission module. Wireless transceiver is achieved by a single-chip RF transceiver nRF905. MCU and nRF905 realize data and commands interaction through the SPI interface.The typical application schematic is shown in Figur
16、e 4. The antenna part is 50 single-ended antenna.The communication frequency is 433MHz, and operating voltage is 3.3V. The value of resistors,capacitors and inductor is determined by the datasheet of nRF905.GSM short message unit. The interface circuit of TC35i and MCU is shown in Figure 5. Thecommunication between MCU and TC35i is via serial, and the rate is
