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可燃性氣體檢測與報警系統的外文翻譯--使用無線的可燃氣體檢測系統的設計-免費閱讀

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【正文】電容層析成像技術對氣固兩相流循環流化床的研究[J]測量。無線接收程序，nRF905接收數據的過程如下：1）當TRX _這= 1和TX _ = 0，nRF905 enters shockbursttm receive模式不斷和等待接收數據的檢查2）當nRF905檢測載體具有相同的頻段，載波檢測引腳將被設置高。的munication between MCU and TC35i is via serial, and the rate is 9600bps. Communicationsmode is 8bit asynchronous with a start bit, 8 data bits, and 1 stop bit. But the serial input of TC35i requires CMOS level, and serial output of 89C52 requires TTL level. In order to achieve the voltage conversion the system use the way of resistors sharing voltage.單片機與TC35I之間的通信是通過串行，和速率是9600。為了提高系統的精度，結果必須進行溫度補償和溫度校正。如果氣體濃度異常，系統會發出報警信號并利用TC35I模塊發送報警信息到用戶的手機揚聲器驅動。系統的設計該系統由兩部分組成，如圖1所示圖1系統總體框圖下位機部分主要完成數據采集和無線傳輸。由于傳感器的精度受環境的影響，采用DS18B20實現溫度補償。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。3) Beacause of AUTO_RETRAN being high, the data of nRF905 is constantly reissued untilTRX_CE=0.4) when TRX_CE pin is set low, means the data transmission pleted and nRF905 enter idlemode.Wireless receiving program. NRF905 data receiving process is as follows:1) When TRX_CE = 1 and TX_EN = 0, nRF905 enters ShockBurstTM receive mode checking constantly and waiting for receiving data.2) When nRF905 detect the carrier having same frequency band, the carrier detect pin will be set high.3) When nRF905 receive a matched address, the address matches pin will be set high.4) When packet correctly received, the word head, address and CRC bits will automatically beremoved, and the data ready pin will be set high.5) MCU set TRX_CE to 0, and nRF905 enter to idle mode.6) When all the data received, nRF905 set data ready pin and address matching pin to 0, andnRF905 turn to shutdown mode or ShockBurstTM transmitmode and receive mode. Wireless data transmission flow chart Wireless data receiving flow chartSummaryDesigned an equipment to detect the concentration of bustible gas, which has wireless transceiver functions and can send the alarm information to user’s mobile promptly through results show that the devices have high precision, stability and reliability.

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