基于ds18b20分組方式測(cè)溫系統(tǒng)設(shè)計(jì)外文翻譯-資料下載頁(yè)
2025-05-12 13:20本頁(yè)面
【導(dǎo)讀】摘要：當(dāng)用于多點(diǎn)測(cè)溫時(shí)，所有的DS18B20傳感器都連接在單片機(jī)的某根總線上，會(huì)明顯延長(zhǎng)，從而導(dǎo)致測(cè)溫系統(tǒng)周期增長(zhǎng)。在本文中，采取對(duì)DS18B20合理的分組的方法，并在軟件上采取一定措施，從而明顯的提高交替檢測(cè)速度。而被廣泛應(yīng)用于需要多點(diǎn)測(cè)溫的地方，像化工，糧食，環(huán)境監(jiān)測(cè)等等。溫度測(cè)試系統(tǒng)采用的是單總線方式，所有的DS18B20傳感器掛在一根總線上，不小，如果測(cè)溫系統(tǒng)規(guī)模較大的話，由此造成的系統(tǒng)損耗也是相當(dāng)大的。響轉(zhuǎn)換精度及可靠性。本文實(shí)現(xiàn)了一套人工環(huán)境實(shí)驗(yàn)室的多點(diǎn)溫度測(cè)試，明顯提。溫度變換為數(shù)字可在720ms內(nèi)完成，每一個(gè)DS18B20具有唯一的64位的序。超過(guò)1個(gè)，這樣讀數(shù)時(shí)就能解決。電源采取外部供電，由于每個(gè)DS18B20都是同。DS18B20進(jìn)行讀寫時(shí)，必須嚴(yán)格保持時(shí)序要求。首先給所有的DS18B20發(fā)一個(gè)復(fù)。量，所以必須根據(jù)外殼的散熱情況采取具體的保溫措施。因?yàn)橐獙?duì)DS18B20的序列號(hào)進(jìn)行區(qū)分和編碼，所以增加了液晶模塊和鍵盤。MAX813的WDI管腳發(fā)送一個(gè)脈沖信號(hào)，以清除芯片內(nèi)部看門狗定時(shí)器。
【正文】 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 。 the same content is sent for three times 。 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。 for(i=0。i8。i++) {skip_rom(i)。//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 )。} //transform the temperature in each circuit at the same time for(j=0。j100。j++) // prolong the time for 。 wait for the end of conversion {delay(1000)。} For(j=0。j15。j++) { match_ rom(j)。 read_ scratchpads (j)。 } //each temperature value is read in 8 buses for(j=0。j120。j++) {temp_lsb = temp_pad[j][0] 。 //the data conversion of the temperature value temp_msb = temp_pad[j][1] 。 temp_lsb = 4 。 temp_msb = 4 。 temp_lsb |=temp_msb。 temp_msb = (temp_lsb/10) 。 temp_msb =4 。 temp_lsb %= 10 。 temp_lsb |=temp_msb。 temperature_ vel[j] = temp_lsb。}} V. CONCLUSION Authors create the following new ideas 1） Alternate test time difference of the multipoint temperature test system in the grouping method and the single bus method is analyzed, then the alternate test speed can be increased greatly by grouping method. 2） A set of wireless multipoint temperature test system is designed by DS18B20 grouping method. This system is applied to the technology reform of the asphalt transportation vehicle in some domestic largescale engineering mechanical pany and the good result of the application is achieved. 基于 DS18B20 分組方式測(cè)溫系統(tǒng)設(shè)計(jì) 18 REFERENCES [1] ShenJin,SongJingLing. An Alldigital Temperature Measuring System Used in Grain of the chese society for Agricultural Machinery,2020,(2):89 91. [2] LiMinHui,Jung Deqiong. A Device of Temperature Measuremen Made up of DS1820 and AT89C205. Journal of Sichan Normal University 1997,(5):9396 [3] Qi ZhiCai,Gai Shuang. Embedded Control System of the CentralAir conditioner Room,InstrumentTechnique and Sensor 2020,(5):2526. [4] ZhangPeiren,ZhouYanping. A LargeScale Temperature Alarm System Based on 1 Wire Bus and CAN bus, Controlamp。Automation 2020,(2):2526
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1