可燃性氣體檢測與報警系統(tǒng)的外文翻譯--使用無線的可燃氣體檢測系統(tǒng)的設計-展示頁
2025-01-25 12:00本頁面
【正文】 ation of bustible 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 with 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 circuitFig. 3 Temperature pensation circuitTemperature pensation circuit. The resistance of Rs is greatly affected by temperature. In order to improve system accuracy, the results must be temperature pensated or temperature system, using temperature sensor DS1820 to collect temperature signal, and using software method for temperature correction.Wireless transmission module. Wireless transceiver is achieved by a singlechip RF transceiver nRF905. MCU and nRF905 realize data and mands interaction through the SPI typical application schematic is shown in Figure 4. The antenna part is 50Ω singleended munication frequency is 433MHz, and operating voltage is . 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. Themunication 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.Fig. 4 nRF905 Application SchematicFig. 5 TC35i and MCU interface circuitSoftware DesignThe software system includes data acquisition module, temperature pensation module, and wireless transceiver moduleWireless sending program. NRF905 data sending process is as follows:1) When having data to send, the microcontroller send the receiver39。 本科畢業(yè)論文(設計)外 文 文 獻 翻 譯譯文題目： Design of detection of bustible gas and alarm system 學生姓名： 專 業(yè)： 指導教師： 2013年 2 月第13頁原文：Design of Combustible Gas Detection system u
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