介紹了一種基于MSP430系列單片機(jī)和ADXL203加速度傳感器的數(shù)字式傾角儀，它不僅可以實現(xiàn)水平度檢測，而且可以測量00～3600范圍內(nèi)的任意傾角，分辨率可達(dá)O．1。。此外，由于該傾角儀輸出為數(shù)字結(jié)果，因此它也可以與其他的數(shù)字設(shè)備結(jié)合起來，組合成一個功能更加強(qiáng)大的儀器。該數(shù)字傾角儀可廣泛應(yīng)用于建筑、機(jī)械、道路、橋梁、石油、煤礦和地質(zhì)勘探等各種需要測量重力參考系下傾角的場合。關(guān)鍵詞：MSP430F133單片機(jī)；力敏傳感器；ADXL203加速度計；角度測量 Abstract：This paper presents a new style digital inclinometer which is developed on the basis of the MSP430F133 MCU and the ADXL203 dual axis aeeelerometer．This inclinometer not only can test levelness，but also can measure any angle between 0。and 360。with an accuracy of 0．1 O．In addition，its output is a digital result，which makes it possible to integrate itself with other digital devices to form a more functional unit．This inclinometer can be widely used in any construction site，oil field，coal-mine or geologic survey and SO on where it will provide the working people with convenience to measure any angles．Key words：MSP430F133 MCU；force sensor；ADXL203 accelerometer；angle measurement
上傳時間： 2013-11-14
上傳用戶：lizhizheng88
介紹了用單片機(jī)C 語言實現(xiàn)無功補(bǔ)償中電容組循環(huán)投切的基本原理和算法，并舉例說明。關(guān)鍵詞：循環(huán)投切;C51;無功補(bǔ)償中圖分類號： TM76 文獻(xiàn)標(biāo)識碼： BAbstract: This paper introduces the aplication of C51 in the controlling of capacitorsuits cycle powered to be on and off in reactive compensation.it illustrate thefondamental principle and algorithm with example.Key words: cycle powered to be on and off; C51; reactive compensation 為提高功率因數(shù)，往往采用補(bǔ)償電容的方法來實現(xiàn)。而電容器的容量是由實時功率因數(shù)與標(biāo)準(zhǔn)值進(jìn)行比較來決定的，實時功率因數(shù)小于標(biāo)準(zhǔn)值時，需投入電容組，實時功率因數(shù)大于標(biāo)準(zhǔn)值時，則需切除電容組。投切方式的不合理，會對電容器造成損壞，現(xiàn)有的控制器多采用“順序投切”方式，在這種投切方式下排序在前的電容器組，先投后切；而后面的卻后投先切。這不僅使處于前面的電容組經(jīng)常處于運(yùn)行狀態(tài)，積累熱量不易散失，影響其使用壽命，而且使后面的投切開關(guān)經(jīng)常動作，同樣減少壽命。合理的投切方式應(yīng)為“循環(huán)投切”。這種投切方式使先投入的運(yùn)行的電容組先退出，后投的后切除，從而使各組電容及投切開關(guān)使用機(jī)率均等，降低了電容組的平均運(yùn)行溫度，減少了投切開關(guān)的動作次數(shù)，延長了其使用壽命。
標(biāo)簽： C51 無功補(bǔ)償 循環(huán) 電容
上傳時間： 2014-12-27
上傳用戶：hopy
本文針對實驗平臺管理系統(tǒng)的實際需求,結(jié)合密碼技術(shù)和身份認(rèn)證技術(shù),采用了基于USB Key的雙因子身份認(rèn)證技術(shù)。目前眾多身份認(rèn)證技術(shù)當(dāng)中,USB Key是被認(rèn)為最安全的身份認(rèn)證手段,除了生物特征身份認(rèn)證技術(shù)。但是因為成本問題,生物特征身份認(rèn)證技術(shù)并沒有被廣泛使用。而且通過深入研究,可以進(jìn)一步完善USB Key的功能,使USB Key不僅能起到認(rèn)證的作用,還可以用于存儲數(shù)據(jù)。因此,隨著人們對網(wǎng)絡(luò)安全問題的重視程度加深,USB Key身份認(rèn)證方式將在各安全需求領(lǐng)域大顯身手
上傳時間： 2014-12-27
上傳用戶：sun_pro12580
根據(jù)看門狗電路的原理，設(shè)計出簡單適用、性能可靠的1TrL型看門狗電路以及價格低廉、性能可靠的微功耗CMOS型看門狗電路，同時還介紹了常用的uP監(jiān)視器O型看門狗電路。關(guān)鍵詞：看門狗電路；1TrL型；CMOS型Abstract：In accordance with the principle of WDT (Watch Dog Timer 1circuit，design a，IT．L type WTD circuit，it is a dimple an d applicable an d reliable on performanceo Design a CMOS type WTD circuit，it is low prices and mini-power consumption。Also the article describes a common uP type WTD circuit。Key word：WDT circuit；TFL type；CMOS typ e
上傳時間： 2013-11-05
上傳用戶：685
The CAT823, CAT824, and CAT825 provide basic reset and monitoring functions for the electronic systems. Each device monitors the system voltage and maintains a reset output until that voltage reaches the device’s specified trip value and then maintains the reset output active condition until the device’s internal timer, after a minimum timer of 140ms; toallow the systems power supply to stabilize.
上傳時間： 2014-11-18
上傳用戶：BOBOniu
本文依據(jù)集成電路設(shè)計方法學(xué)，探討了一種基于標(biāo)準(zhǔn)Intel 8086 微處理器的單芯片計算機(jī)平臺的架構(gòu)。研究了其與SDRAM，8255 并行接口等外圍IP 的集成，并在對AMBA協(xié)議和8086 CPU分析的基礎(chǔ)上，采用遵從AMBA傳輸協(xié)議的系統(tǒng)總線代替?zhèn)鹘y(tǒng)的8086 CPU三總線結(jié)構(gòu)，搭建了基于8086 IP 軟核的單芯片計算機(jī)系統(tǒng)，并實現(xiàn)了FPGA 功能演示。關(guān)鍵詞：微處理器； SoC；單芯片計算機(jī)；AMBA 協(xié)議 Design of 8086 CPU Based Computer-on-a-chip System（School of Electrical Engineering and Automation, Heifei University of Technology, Hefei, 230009,China）Abstract: According to the IC design methodology, this paper discusses the design of one kind of Computer-on-a-chip system architecture, which is based on the standard Intel8086 microprocessor,investigates how to integrate the 8086 CPU and peripheral IP such as, SDRAM controller, 8255 PPI etc. Based on the analysis of the standard Intel8086 microprocessor and AMBA Specification,the Computer-on-a-chip system based on 8086 CPU which uses AMBA bus instead of traditional three-bus structure of 8086 CPU is constructed, and the FPGA hardware emulation is fulfilled.Key words: Microprocessor; SoC; Computer-on-a-chip; AMBA Specification
標(biāo)簽： 8086 CPU 單芯片 計算機(jī)系統(tǒng)
上傳時間： 2013-12-27
上傳用戶：kernor
基于單DSP的VoIP模擬電話適配器研究與實現(xiàn):提出和實現(xiàn)了一種新穎的基于單個通用數(shù)字信號處理器(DSP)的VoIP模擬電話適配器方案。DSP的I/O和存儲資源非常有限，通常適于運(yùn)算密集型應(yīng)用，不適宜控制密集型應(yīng)用[5]。該系統(tǒng)高效利用單DSP的I/O和片內(nèi)外存儲器資源，采用μC/OS-II嵌入式實時操作系統(tǒng)，支持SIP和TCP-UDP/IP協(xié)議，通過LAN或者寬帶接入，使普通電話機(jī)成為Internet終端，實現(xiàn)IP電話。該系統(tǒng)軟硬件結(jié)構(gòu)緊湊高效，運(yùn)行穩(wěn)定，成本低，具有廣闊的應(yīng)用前景。關(guān)鍵詞：模擬電話適配器；IP電話；數(shù)字信號處理器；μC/OS-II 【Abstract】This paper presents a VoIP ATA solution based on a single digital signal processor (DSP). DSPs are suitable for arithmetic-intensiveapplication and unsuitable for control-intensive application because of the limitation of I/O and memory resources. This solution is based on a 16-bitfixed-point DSP and μC/OS-II embedded real-time operating system. It makes good use of the limited resources, supports SIP and TCP-UDP/IPprotocol. It can connect the analog telephone to Internet and realize the VoIP application. This system has a great future for its high efficiency andlow cost.【Key words】Analog telephone adapter (ATA); Voice over Internet protocol (VoIP); Digital signal processor (DSP); μC/OS-II Research and Implementation of VoIPATA Based on Single DSP
上傳時間： 2013-11-20
上傳用戶：Wwill
高壓雙管反激變換器的設(shè)計:介紹一種雙管反激的電路拓?fù)洌治隽似涔ぷ髟恚o出了一些關(guān)鍵技術(shù)參數(shù)的計算公式，設(shè)計并研制成功的30W 380V AC5 0H z/510V DC/+15.1 V DC(1A )、+5.2VDC(2A)輔助開關(guān)電源具有功率密度高、變換效率高、可靠性高等優(yōu)良的綜合性能。該變換器在高電壓輸人情況下有重要的應(yīng)用價值。【關(guān) 鍵 詞 】變換器，輔助開關(guān)電源，雙管反激 [Abstract】 A n e wt opologyfo rd oubles witchfl ybackc onverteris in troduced.Th eo perationp rincipleis a nalyzeda nds ome for mulas for calculating key parameters for the topology are presented. The designed and produced auxiliary switching power supply,i. e. 30W 380V AC5 0H z/5 10V DC/+15.1 V DC《1A )、+5.2 V DC《2A )，hase xcellentc omprehensivep erformances sucha sh ighp owerd ensity, hi ghc onversione fficiencya ndh ighr eliability.Th isc onverterh asim portanta pplicationv aluef orh igh input voltag [Keywords ]converter,au xiliary switchingp owers upply,do ubles witchf lybac
上傳時間： 2013-11-01
上傳用戶：Ants
單片機(jī)軟件濾波的幾種方法:假定從AD中讀取數(shù)據(jù)的子程序為：unsigned int get_ad();1、限幅濾波法（又稱程序判斷濾波法）A、方法：根據(jù)經(jīng)驗判斷，確定兩次采樣允許的最大偏差值（設(shè)為A）。每次檢測到新值時判斷：如果本次值與上次值之差<=A,則本次值有效；如果本次值與上次值之差>A,則本次值無效,放棄本次值,用上次值代替本次值。B、優(yōu)點：能有效克服因偶然因素引起的脈沖干擾C、缺點：無法抑制那種周期性的干擾，平滑度差D、軟件實現(xiàn)：//=======================//值A(chǔ)可根據(jù)實際情況調(diào)整，value為有效值，new_value為當(dāng)前采樣值//濾波程序返回有效的實際值
上傳時間： 2013-10-20
上傳用戶：xiaojie
基于單片機(jī)的步進(jìn)電機(jī)開環(huán)控制系統(tǒng):通過ATMEL89C51單片機(jī)對步進(jìn)電機(jī)進(jìn)行控制,主要介紹了步進(jìn)電機(jī)控制器、驅(qū)動電路和LED顯示電路的設(shè)計,實現(xiàn)了步進(jìn)電機(jī)的開環(huán)控制。在步進(jìn)電機(jī)控制器的設(shè)計中,重點闡述了脈沖產(chǎn)生電路以及對速度的控制。該系統(tǒng)具有成本低、控制方便的特點。關(guān)鍵詞: 單片機(jī); 步進(jìn)電機(jī); 開環(huán)控制 Abstract: The design using ATMEL89C51 single chip to control the step2motor with its controller, driving circuit and LED disp lay circuit to realize step motor open2loop controlwere introduced. For the controller in this design,the circuit to p roduce pulse and the speed controlwere expatiated emphatically. This system possesses features of lower cost, easier control.Key words: single ch ip; step2motor; open2loop con trol
標(biāo)簽： 單片機(jī) 步進(jìn)電機(jī) 開環(huán) 控制系統(tǒng)
上傳時間： 2013-10-13
上傳用戶：cicizoe
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