基于ds18b20分組方式測(cè)溫系統(tǒng)設(shè)計(jì)外文翻譯(文件)
【正文】 code of DS18S20 is read and numbered, the liquid crystal module (Ao Kela Chinese integrated module of OCMJ Jin Peng Company) and the keyboard module are added. The wireless digital transmission adopts the wireless module PTR2020 in the whole receptionsending form, which may has two amateur bands to choose and the regulative Baud Rate ( the max is 20Kbit/s), and the SingleChip Microputer serial port data can be received directly. The system hardware structure is shown as Fig 7: DS18B20, with the power supply, divided into 8 groups hung on P1 port (). The wireless module is hung on serial port directly and the hardware watchdog adopts the MAX813 chip. When the power is added to the system, the 89C52 reversion signal is transmitted from the MAX813 reversion pin, and the value of the reversion pulse is 200ms. When the procedure is in order, a pulse signal must 基于 DS18B20 分組方式測(cè)溫系統(tǒng)設(shè)計(jì) 15 be sent to MAX813 WDI pin in no more than the interval of to clear away the watchdog timer. If the interval is more than , the pin does not receive the pulse signal, and then the 89C52 must be reversed. As 120 DS18B20 serial numbers must be stored in the system, the data storage DS1225 (8K) against the power failure is developed. B. System software function and process The software part of the temperature test system numbers DS18B20, collects and transforms data, performs the wireless munication, manages keyboard and so on. For the convenience of the procedure debugging and the reliability, the module design is adopted, mainly including the keyboard processing module, the wireless munication module, the module of temperature collection and processing, the display module and so on. The software flow chart is shown as Fig 8 After the reversion of add power 89C52 selfchecks first, then allocates each branch procedure module. The chief procedure manages the keyboard, initializes the system and transfers each functional module. The haul line is kept to perform DS18B20 edit mission. 120 points serial number of DS18B20 is read by the keyboard and display coordination and numbered into DS1225Y. First the wireless module is set up as the reception state to receive the collection parameters and start the order (The transmission content is sent by pack 。i8。j100。j15。j120。 temp_msb = 4 。 temp_lsb %= 10 。Automation 2020,(2):2526 。 temperature_ vel[j] = temp_lsb。 temp_msb = (temp_lsb/10) 。 //the data conversion of the temperature value temp_msb = temp_pad[j][1] 。 read_ scratchpads (j)。 wait for the end of conversion {delay(1000)。//skip over the serial numbers to check 基于 DS18B20 分組方式測(cè)溫系統(tǒng)設(shè)計(jì) 17 write_bytes(0x44 )。 two out of three logic is performed according to the bit). 基于 DS18B20 分組方式測(cè)溫系統(tǒng)設(shè)計(jì) 16 The wireless module is set up as the sleep state during the conversion and the transforming state during the temperature data transmission. Packing sends the temperature data and the DS18B20 numbers in the system to epigenous machine. The parts of collection and conversion start the DS18B20 conversion, read the temperature data by grouping methods, store data and so on. The following procedure is the main content of collecting and conversion modules: void Get_ Temperature(void) { uchar i,j , temp_ lsb, temp_ msb。the writing period of one bit is 60us120us。}} 5 結(jié)論 本文作者創(chuàng)新點(diǎn)： 1) 通過(guò)分析基于單總 線方式和分組方式的多點(diǎn)溫度測(cè)試系統(tǒng)的交替檢測(cè)時(shí)間的差別，得出分組方式能明顯提高交替檢測(cè)速度； 2) 設(shè)計(jì)了一套基于 DS18B20分組方式的無(wú)線多點(diǎn)溫度測(cè)試系統(tǒng)，這套系統(tǒng)已經(jīng)用于一家大型機(jī)械公司的瀝青運(yùn)輸車的技術(shù)改造中，并取得良好的效果。 temp_msb =4 。 temp_lsb = 4 。 } for(j=0。} For(j=0。//跳過(guò)序列號(hào)檢驗(yàn) write_bytes(0x44 )。以下程序?yàn)椴杉?，轉(zhuǎn)換模塊的主要內(nèi)容： void Get_ Temperature(void) 基于 DS18B20 分組方式測(cè)溫系統(tǒng)設(shè)計(jì) 7 { uchar i,j , te
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