Abstract: It is incredible how many programmable logic controls (PLCs) around us make our modern life possible and pleasant.Machines in our homes heat and cool our air and water, as well as preserve and cook our food. This tutorial explains the importanceof PLCs, and describes how to choose component parts using the parametric tools on the Maxim's website.A similar version of this article was published February 29, 2012 in John Day's Automotive Electronic News.
上傳時(shí)間： 2013-11-10
上傳用戶：liaocs77
為解決我國水位監(jiān)測野外條件下長期無人看守的問題，研制開發(fā)了基于MSP430單片機(jī)的智能水位計(jì)。從其組成到各功能分別進(jìn)行了詳細(xì)的介紹，該智能水位計(jì)不僅實(shí)現(xiàn)了水位數(shù)據(jù)的實(shí)時(shí)監(jiān)測、記錄和定期采集等多種工作模式，而且提高了水位監(jiān)測精度，實(shí)現(xiàn)了水位監(jiān)測的智能化。 Abstract: In order to solve the problems of long-term unmanned observation in the field water monitoring，an intelligence water-level meter based on MSP430 is developed composition and every function moduce of the water level meter was introduced in detail. It not only realizes water level data collection and storage， regularly gathering and so on， but also improves the water-level precision ， finally realizes the intelligence.
標(biāo)簽： MSP 430 單片機(jī) 水位計(jì)
上傳時(shí)間： 2013-11-17
上傳用戶：417313137
設(shè)計(jì)了一種基于PIC16C71單片機(jī)的數(shù)字水溫配制閥。該配制閥采用NTC熱敏電阻作溫度傳感器，與固定電阻組成簡單分壓電路作為水溫測量電路，利用PIC16C71單片機(jī)內(nèi)置的8位A/D轉(zhuǎn)換器把熱敏電阻上的模擬電壓轉(zhuǎn)換為數(shù)字量，PIC16C71單片機(jī)控制直流電機(jī)驅(qū)動(dòng)混水閥調(diào)節(jié)冷熱水的混合比例實(shí)現(xiàn)水溫調(diào)節(jié)。給出了控制電路圖，對水溫測量電路的參數(shù)選擇和測溫精度作了詳細(xì)討論。實(shí)驗(yàn)和分析表明，選用阻值較大的NTC熱敏電阻和分壓電阻可較好地解決熱敏電阻因功耗較大造成的熱擊穿問題。 Abstract: A digital valve for controlling water temperature based on PIC16C71 was presented in this paper.A bleeder circuit which consisted of a NTC thermistor as temperature sensor and a fixed resistance was designed as water temperature measuring circuit.The analog voltage on the thermistor was converted into digital signal by a 8-bit A/D converter embedded in PIC16C71. Based on the digital signal， the MCU PIC16C71 drived the valve by a DC motor to adjust the water temperature through adjusting the proportion of hot water and cold water.The circuit diagram of controller was given，the principle，the component parameters and the accuracy of measuring temperatures were also dissertated in detail. It was found by experiment and analysis that thermal breakdown of thermistor caused by high power could be solved by selecting thermistor and fixed resistance with high impedance value.
上傳時(shí)間： 2013-11-08
上傳用戶：Yue Zhong
介紹一種應(yīng)用于長城賽弗SUV汽車后門車窗多功能控制器，能實(shí)現(xiàn)對電動(dòng)玻璃車窗、車窗雨刮器、噴水器以及電加熱除霜器等控制。介紹了基于NXP P89LPC922單片機(jī)多功能汽車后車窗控制器的控制功能、硬件電路原理和軟件設(shè)計(jì)方法。 Abstract: This paper presents a multipurpose automotive rear windows controller for CHANGCHENG SAFE SUV.The controller can control rear power-operated window,rear wiping,washing water pump and rear defroster of the windows. In this paper, it is introduced in detail that the functions and the design of the circuit and program of the controller based on NXP P89LPC922 MCU.
上傳時(shí)間： 2013-11-13
上傳用戶：z754970244
本文介紹了基于AT89C52 單片機(jī)的自動(dòng)水溫控制系統(tǒng)的設(shè)計(jì)及實(shí)現(xiàn)過程。該系統(tǒng)具有實(shí)時(shí)顯示、溫度測量、溫度設(shè)定并能根據(jù)設(shè)定值對環(huán)境溫度進(jìn)行調(diào)節(jié)實(shí)現(xiàn)控溫的目的以及達(dá)到上下限溫度報(bào)警功能，控制算法是基于數(shù)字PID 算法。關(guān)鍵詞 ：PID AT89C52 脈寬調(diào)制 實(shí)時(shí) Abstract ： This article describes AT89C52 single-chip microcomputer-basedautomatic water temperature control system design and implementation process. Thesystem has real-time display, temperature measurement, temperature settings and theenvironment in accordance with the temperature settings adjusted to achieve thepurpose of temperature control and reach the upper and lower limits of temperaturealarm function, the control algorithm is based on the digital PID algorithm.Keyword: PID AT89C52 PWM real time
上傳時(shí)間： 2013-10-10
上傳用戶：歸海惜雪
摘要：本水位監(jiān)測報(bào)警器使用5V低壓直流電源（也可以用3節(jié)5號電池代替）就可以對5~15厘米的水位進(jìn)行監(jiān)測，用LED顯示和數(shù)碼管顯示水位，并可以對不再此范圍內(nèi)的水位發(fā)出報(bào)警。主要采用CD4066、74LS86、74LS32、CD4511芯片，再加上數(shù)碼管、蜂鳴器、發(fā)光二極管、電阻這些器件組成一個(gè)簡單而靈敏的監(jiān)測報(bào)警電路，操作簡單，接通電源即可工作。因?yàn)榇蟛糠蛛娐凡捎脭?shù)字電路，所以本水位監(jiān)測報(bào)警器還具有耗能低、準(zhǔn)確性高的特點(diǎn)。關(guān)鍵字：譯碼電路 報(bào)警電路 監(jiān)測電路 Abstract: The water level alarm monitoring the use of 5 V low-voltage DC power (can also use three batteries replaced on the 5th) will be able to 5 to 15 centimeters of water level monitoring, with LED display and digital display of water level, and this can no longer Within the scope of a water level alarm. Mainly CD4066, 74LS86, 74LS32, CD4511 chips, coupled with digital control, buzzer, light-emitting diode, the resistance of these devices composed of a simple and sensitive monitoring alarm circuits. Because the majority of circuits using digital circuitry, so the water level monitored alarm system also has low energy consumption, high accuracy of the characteristics. Keyword: Decoding circuit alarm circuit monitoring circuit
標(biāo)簽： 水位 監(jiān)測報(bào)警 系統(tǒng)原理
上傳時(shí)間： 2013-11-05
上傳用戶：王慶才
基于多點(diǎn)網(wǎng)絡(luò)的水廠自動(dòng)監(jiān)控系統(tǒng)設(shè)計(jì)Design of MPI Based Automatic Monitoring and Control System in Water Works劉 美 俊(湖南工程學(xué)院，湘潭411101)摘要針對水廠工作水泵多、現(xiàn)場離控制站距離遠(yuǎn)的特點(diǎn)，提出了一種基于MPI多點(diǎn)網(wǎng)絡(luò)的自動(dòng)監(jiān)控系統(tǒng)的設(shè)計(jì)方法，分析了系統(tǒng)的工作原理，介紹了系統(tǒng)中數(shù)據(jù)的采集與處理、主站與從站的通信原理以及系統(tǒng)軟件的設(shè)計(jì)。由于這種系統(tǒng)的主、從站PLC之間采用MPI網(wǎng)絡(luò)通信，具有運(yùn)行可靠、性能價(jià)格比高的特點(diǎn)，所以適用于中小規(guī)模水廠的分布式監(jiān)控場合。關(guān)鍵詞多點(diǎn)網(wǎng)絡(luò)主站從站監(jiān)控系統(tǒng)Abstract Ina ccordancew ithth efe atuersof w aterw orks,i. e. ，manyp umpsin o perationa ndth ep umps， farfor mt hec ontrolst ation,th em ethodo fdesigninga na utomati(〕monitoringa ndc ontorlsy stemb asedo nM PIis p resented.Th eo perationalpr incipleo fth esy stemi san alyzed,th ed atac olection,data processing; communication between master station and slave station as wel as design and system software are discussed. Because MPI network communicationis used among master station, slave stations and PLC, the system is reliable and high cost-efective. It is， suitable for smal and mediumsized water works for distrbuted monitoring and control.Keywords MPI Masterst ation Slaves tation Monitoringa ndc ontorlsy stem 自來 水 廠 的自動(dòng)控制系統(tǒng)一般分為兩大部分，一對組態(tài)硬件要求較高，投資較大。相對而言，MPI網(wǎng)是水源地深水泵的工作控制，一是水廠區(qū)變頻恒壓供絡(luò)速度可達(dá)187.5 M bps，通過一級中繼器傳輸距離可水控制，兩部分的實(shí)際距離通常都比較遠(yuǎn)。某廠水源達(dá)Ikm 。根據(jù)水廠的具體情況，確定以MPI方式組地有3臺(tái)深井泵給水廠區(qū)的蓄水池供水。水廠區(qū)的成網(wǎng)絡(luò)，主站PLC為S7-300系列的CPU3121FM，從任務(wù)是對水池的水進(jìn)行消毒處理后，通過加壓泵向管站為S7-200系列的CPU222。這樣既滿足了系統(tǒng)要路恒壓供水。選用Siemens公司的S7系列可編程控求，又相對于Profibus網(wǎng)絡(luò)節(jié)省了三分之一的成本，制器(PLC)和上位機(jī)組成實(shí)時(shí)數(shù)據(jù)采集和監(jiān)控系統(tǒng)， 這種分布式監(jiān)控系統(tǒng)具有較高的性能價(jià)格比。系統(tǒng)對深水泵進(jìn)行遠(yuǎn)程控制，對供水泵采用變頻器進(jìn)行恒中PLC的物理層采用RS - 485接口，網(wǎng)絡(luò)延伸選用壓控制以保證整個(gè)水廠的電機(jī)設(shè)備安全、可靠地運(yùn)帶防雷保護(hù)的中繼器，使系統(tǒng)的安全運(yùn)行得到了保行。證。MPI網(wǎng)絡(luò)的拓?fù)浣Y(jié)構(gòu)如圖1所示。1 多點(diǎn)網(wǎng)絡(luò)(NWI)監(jiān)控系統(tǒng)的組成Sie me ns 公司S7系列PLC通常有MP」多點(diǎn)網(wǎng)絡(luò)與Profibus現(xiàn)場總線網(wǎng)絡(luò)兩種組網(wǎng)方式。Profibus現(xiàn)場總線的應(yīng)用目前較為普遍，通用性較好，它由Profibus一DP, Profibus一FMS, Profibus一PA組成。Profibus - DP型用于分散外設(shè)間的數(shù)據(jù)傳輸，傳輸速率為9.6kbps一12Mbps，主要用于現(xiàn)場控制器與分散1/0之間的通信，可滿足交直流調(diào)速系統(tǒng)快速響應(yīng)的時(shí)間要求，特別適合于加工自動(dòng)化領(lǐng)域的應(yīng)用;Profibus - FMS主要解決車間級通信問題，完成中等傳輸速度的循環(huán)或非循環(huán)數(shù)據(jù)交換任務(wù)，適用于紡織、樓宇自動(dòng)化、可編程控制器、低壓開關(guān)等;Profibus - PA型采用了OSI模型的物理層和數(shù)據(jù)鏈路層，適用于過程自動(dòng)化的總線類型。
標(biāo)簽： 多點(diǎn) 網(wǎng)絡(luò) 系統(tǒng)設(shè)計(jì) 自動(dòng)監(jiān)控
上傳時(shí)間： 2013-10-09
上傳用戶：fac1003
vxworks下的GIS系統(tǒng)。 使用說明： 1.下載 "VxEmapgis.out" 或則 "VxEmapgis2.out" 到目標(biāo)機(jī) 2.運(yùn)行 "main" ，啟動(dòng)應(yīng)用程序 , 3.按 "ESC" 彈出菜單， 4.選擇 "打開圖層" ， 彈出圖打開窗口 ， 輸入圖層文件名稱 如 “road.vxw” 或者 “water.vxw” 5.按 大寫字母"O"，確定， 或者大寫字母 “C”取消 6.按方向箭頭、pagedown , pageup 實(shí)現(xiàn)漫游 ， , + , - 實(shí)現(xiàn)縮放 7.按 "ESC" 第二次可以取消菜單 8.圖層控制窗口中,列出了已打開的圖層 , 使用方向箭頭移動(dòng),選擇相應(yīng)的圖層可以關(guān)閉,也可以在這里打開圖層 9.選擇菜單項(xiàng) 退出系統(tǒng) ，結(jié)束應(yīng)用程序 注：需要支持x86-bios 的PC機(jī) ， 我測試所用機(jī)器是: 目標(biāo)機(jī): p2的350M cpu + 256M內(nèi)存 + Tornado2.02 + windml2.0 主機(jī): p4 + window2000 server 雖然我已經(jīng)把windml的庫連接到程序里，可能還需要安裝WINDML2.0,我不大確定. 需要把圖層文件（“road.vxw” , “water.vxw” , "region.vxw" , "placename.vxw"）,符號文件(symbollib目錄)等 拷貝到wftpd的根目錄下面 VxEmapgis.out : 沒有中斷提示 VxEmapgis2.out: 有中斷提示
標(biāo)簽： VxEmapgis out vxworks main
上傳時(shí)間： 2015-03-25
上傳用戶：stella2015
Digital Thermostat with High Accuracy -6,00 to 46,00 °C Digital Thermostat We build a digital thermostat for home applications, which controls the room temperature. I used the AT90S2313 microprocessor of ATMEL. The digital thermostat opens the main heating valve of the apartment and the hot water flows in the radiators. Digital Thermostat Board
標(biāo)簽： Thermostat Digital Accuracy digital
上傳時(shí)間： 2014-01-18
上傳用戶：D&L37
The Capacity of a MIMO channel with nt transmit antenna and nr recieve antenna is analyzed. The power in parallel channel (after decomposition) is distributed as water-filling algorithm
標(biāo)簽： antenna The Capacity analyzed
上傳時(shí)間： 2016-02-01
上傳用戶：225588
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