【正文】
sing WirelessTransmission TechnologyShijiazhuang Universities of Economics, Hebei, ChinazkzhlpKeywords:TGS813, AT89S52, DS18B20, nRF905, TC35i detection device of bustible gas are designed in the presented work,using wireless transceiver and GSM system realize the wireless transmission of the gas concentration,and also can send alarm information to user’s mobile when an exception occurs. The system consists of two parts: a master and slave. The function of the slave is to collect data, process data and transffer the data to the taskof the master is to receive data and display it by LED.The signal acquisition is pleted by sensor TGS813 and A/D converter TLC2543. The wireless transmission is achieved through wireless transceiver nRF905. Since the accuracy of the sensor is affected by the environment,using DS18B20 to achieve temperature pensation. And with wireless munication module TC35i and GSM network platform, we can send the alarm information to user’s mobile promptly.IntroductionGas detection is widely used 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 shortings, such as single function, operating plex, bulky, expensive and low sensitivity. Wireless munication technology applied to the gas monitoring field, can resolve the problem of remote monitoring in special environment, such as high temperature, low temperature, toxic unable to wiring .In the presented work, the bustible gas detectoris fully functional (with wireless transceiver), simple, small size, low cost, and has high sensitivity. The equipment can greatly improve the system39。s detection capability and accuracy with temperature pensation algorithm, and also can send alarm information to the user39。s address and the data to nRF905 chronologically by the SPI placed the data to be transmitted into TxBuf register, send WTP mand to write the data to TXPayload register, and send WTA mand to write TX address to the TXAddress register.2) The microcontroller set TRX_CE=1 and TX_EN=1 to stimulate nRF905 ShockBurstTM sending mode. When data transmission pleted, the data ready pin is set high。該系統(tǒng)實(shí)現(xiàn)了氣體濃度的無線傳輸,也可以發(fā)送報(bào)警信息到用戶的移動(dòng)發(fā)生異常時(shí)。奴隸的功能是收集數(shù)據(jù),處理數(shù)據(jù)和過渡到主數(shù)據(jù)。信號(hào)采集由傳感器TGS813和A/D轉(zhuǎn)換器TLC2543完成。由于傳感