實(shí)時(shí)時(shí)鐘是微機(jī)保護(hù)裝置的重要部件，在討論P(yáng)CF8583結(jié)構(gòu)與功能的基礎(chǔ)上，提出采用dsPIC33F系列微處理器與串行I2C時(shí)鐘PCF8583的接口設(shè)計(jì)方案，給出了相應(yīng)的接口電路與軟件流程。該設(shè)計(jì)方案結(jié)構(gòu)簡(jiǎn)單，可靠性高，開(kāi)發(fā)周期短，具有一定的實(shí)用與參考價(jià)值。所設(shè)計(jì)的微機(jī)保護(hù)裝置已投入現(xiàn)場(chǎng)運(yùn)行，效果良好。 Abstract: Real-time clock chip is an important part in microcomputer protection device.Based on discussing the structure and function of PCF8583，a new interface scheme which uses dsPIC33F microprocessor and serial clock chip（I2C）PCF8583is proposed.The method of the circuit design and the main software flow are introduced in this paper.The scheme has simple structure，higher reliability and shorter exploitation cycle，so has definite practicality or reference value.The microcomputer protection device has been put into operation with better effects.
標(biāo)簽： 8583 PCF 串行時(shí)鐘 中的應(yīng)用
上傳時(shí)間： 2013-11-18
上傳用戶(hù)：Thuan
詳細(xì)介紹了PCI9052接口器件的功能、結(jié)構(gòu)和使用方法，并結(jié)合實(shí)際給出了基于PCI9052器件開(kāi)發(fā)PCI總線接口卡的應(yīng)用實(shí)例。 Abstract: The main functions,structures and usage of PCI9052inferface chip are introduced in detail in this paper.And an application example of designing PCI bus interface card based on PCI9052is proposed in this paper.
上傳時(shí)間： 2013-10-16
上傳用戶(hù)：togetsomething
針對(duì)51單片機(jī)系統(tǒng)中常用的A/D轉(zhuǎn)換器價(jià)格高、精度低的缺點(diǎn)，介紹TI公司的16 位的帶有I2C串行接口的A/D轉(zhuǎn)換器ADS1110的工作原理，給出ADS1110與AT89C51單片機(jī)系統(tǒng)的接口電路和軟件設(shè)計(jì)。實(shí)踐證明，ADS1110具有高性?xún)r(jià)比和實(shí)用性。 Abstract: According to the disadvantages of high expense and low accuracy of the general A/D converter used in MCS51 microchip system,the principle and working process of a high accuracy 16-bit A/D conversion ADS1110 which has I2C bus and belongs to TI Company are proposed here as well as the interface of ADS1110 to AT89C51 and software list.It is proved to be high performance index and practicability.
上傳時(shí)間： 2013-11-21
上傳用戶(hù)：gyq
將現(xiàn)行的供暖計(jì)費(fèi)方式由按建筑面積計(jì)費(fèi)變?yōu)榘聪牡臒崮苡?jì)費(fèi)是供暖計(jì)費(fèi)方式發(fā)展趨勢(shì)，為了滿(mǎn)足這一計(jì)費(fèi)方式變化的需要，設(shè)計(jì)了基于IC卡的預(yù)付費(fèi)式新型供暖計(jì)費(fèi)系統(tǒng)，通過(guò)測(cè)量用戶(hù)采暖系統(tǒng)進(jìn)出口的溫度和流量，計(jì)算用戶(hù)消耗的熱能，利用IC卡記錄用戶(hù)預(yù)付費(fèi)的金額和當(dāng)年熱能的單價(jià)，根據(jù)熱能消耗和當(dāng)年熱能的單價(jià)計(jì)算用戶(hù)采暖費(fèi)，根據(jù)實(shí)際發(fā)生的供暖費(fèi)用和預(yù)付費(fèi)金額控制供暖的開(kāi)停，這一計(jì)費(fèi)方式的變化使供暖計(jì)費(fèi)更趨合理。 Abstract: It is trend that the mode of heat charging is changed from billing by building area to by thermal energy. In order to meet the needs of heat charging mode changing， a new system of heat charging based on IC card is proposed. The user?蒺s energy consumption is calculated by measuring the user inlet and outlet temperature and flow，using the IC card to record the prepaid amount and the current price of heat. The user?蒺s heating costs is calculated according to energy consumption and current price， according to actual heating costs and prepaid amount，the system controls the heating opening or stopping. It is more reasonable that calculated heating costs by user heat consumption
標(biāo)簽： IC卡 計(jì)費(fèi) 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-10-14
上傳用戶(hù)：大融融rr
針對(duì)無(wú)位置傳感器無(wú)刷直流電機(jī)的位置檢測(cè)問(wèn)題，本文應(yīng)用單片機(jī)成功地實(shí)現(xiàn)了一種軟件檢測(cè)方法，并給出了實(shí)測(cè)波形加以驗(yàn)證。關(guān)鍵詞： 無(wú)刷直流電機(jī) 無(wú)傳感器 位置檢測(cè)Abstract: As to the position-detecting problem of sensorless brushless DC motor, a softwarerealization by microcomputer is proposed successfully in the paper. Experiment results are also presented to verify the method.Keywords: brushless DC motor, sensorless, position detecting
標(biāo)簽： BLDCM 無(wú)傳感器 位置檢測(cè) 單片機(jī)軟件
上傳時(shí)間： 2013-11-01
上傳用戶(hù)：aappkkee
針對(duì)嵌入式機(jī)器視覺(jué)系統(tǒng)向獨(dú)立化、智能化發(fā)展的要求，介紹了一種嵌入式視覺(jué)系統(tǒng)--智能相機(jī)。基于對(duì)智能相機(jī)體系結(jié)構(gòu)、組成模塊和圖像采集、傳輸和處理技術(shù)的分析，對(duì)國(guó)內(nèi)外的幾款智能相機(jī)進(jìn)行比較。綜合技術(shù)發(fā)展現(xiàn)狀，提出基于FPGA+DSP模式的硬件平臺(tái)，并提出智能相機(jī)的發(fā)展方向。分析結(jié)果表明，該系統(tǒng)設(shè)計(jì)可以實(shí)現(xiàn)脫離PC運(yùn)行，完成圖像獲取與分析，并作出相應(yīng)輸出。 Abstract: This paper introduced an embedded vision system-intelligent camera ，which was for embedded machine vision systems to an independent and intelligent development requirements. Intelligent camera architecture， component modules and image acquisition， transmission and processing technology were analyzed. After comparing integrated technology development of several intelligent cameras at home and abroad， the paper proposed the hardware platform based on FPGA+DSP models and made clear direction of development of intelligent cameras. On the analysis of the design， the results indicate that the system can run from the PC independently to complete the image acquisition and analysis and give a corresponding output.
標(biāo)簽： FPGA DSP 模式 智能相機(jī)
上傳時(shí)間： 2013-10-24
上傳用戶(hù)：bvdragon
在研究傳統(tǒng)家用燃?xì)鈭?bào)警器的基礎(chǔ)上，以ZigBee協(xié)議為平臺(tái)，構(gòu)建mesh網(wǎng)狀網(wǎng)絡(luò)實(shí)現(xiàn)網(wǎng)絡(luò)化的智能語(yǔ)音報(bào)警系統(tǒng)。由于傳感器本身的溫度和實(shí)際環(huán)境溫度的影響，傳感器標(biāo)定后采用軟件補(bǔ)償方法。為了減少系統(tǒng)費(fèi)用，前端節(jié)點(diǎn)采用半功能節(jié)點(diǎn)設(shè)備，路由器和協(xié)調(diào)器采用全功能節(jié)點(diǎn)設(shè)備，構(gòu)建mesh網(wǎng)絡(luò)所形成的家庭內(nèi)部報(bào)警系統(tǒng)，通過(guò)通用的電話(huà)接口連接到外部的公用電話(huà)網(wǎng)絡(luò)，啟動(dòng)語(yǔ)音模塊進(jìn)行報(bào)警。實(shí)驗(yàn)結(jié)果表明，在2.4 GHz頻率下傳輸，有墻等障礙物的情況下，節(jié)點(diǎn)的傳輸距離大約為35 m，能夠滿(mǎn)足家庭需要，且系統(tǒng)工作穩(wěn)定，但在功耗方面仍需進(jìn)一步改善。 Abstract: On the basis of studying traditional household gas alarm system, this paper proposed the platform for the ZigBee protocol，and constructed mesh network to achieve network-based intelligent voice alarm system. Because of the sensor temperature and the actual environment temperature, this system design used software compensation after calibrating sensor. In order to reduce system cost, semi-functional node devices were used as front-end node, however, full-function devices were used as routers and coordinator，constructed alarm system within the family by building mesh network，connected to the external public telephone network through the common telephone interface, started the voice alarm module. The results indicate that nodes transmit about 35m in the distance in case of walls and other obstacles by 2.4GHz frequency transmission, this is able to meet family needs and work steadily, but still needs further improvement in power consumption.
標(biāo)簽： ZigBee 無(wú)線智能 家 報(bào)警系統(tǒng)
上傳時(shí)間： 2013-10-30
上傳用戶(hù)：swaylong
為滿(mǎn)足無(wú)線網(wǎng)絡(luò)技術(shù)具有低功耗、節(jié)點(diǎn)體積小、網(wǎng)絡(luò)容量大、網(wǎng)絡(luò)傳輸可靠等技術(shù)要求，設(shè)計(jì)了一種以MSP430單片機(jī)和CC2420射頻收發(fā)器組成的無(wú)線傳感節(jié)點(diǎn)。通過(guò)分析其節(jié)點(diǎn)組成，提出了ZigBee技術(shù)中的幾種網(wǎng)絡(luò)拓?fù)湫问?，并研究了ZigBee路由算法。針對(duì)不同的傳輸要求形式選用不同的網(wǎng)絡(luò)拓?fù)湫问娇梢员M大可能地減少系統(tǒng)成本。同時(shí)針對(duì)不同網(wǎng)絡(luò)選用正確的ZigBee路由算法有效地減少了網(wǎng)絡(luò)能量消耗，提高了系統(tǒng)的可靠性。應(yīng)用試驗(yàn)表明，采用ZigBee方式通信可以提高傳輸速率且覆蓋范圍大，與傳統(tǒng)的有線通信方式相比可以節(jié)約40%左右的成本。 Abstract: To improve the proposed technical requirements such as low-ower， small nodes， large capacity and reliable network transmission， wireless sensor nodes based on MSP430 MCU and CC2420 RF transceiver were designed. This paper provided network topology of ZigBee technology by analysing the component of the nodes and researched ZigBee routing algorithm. Aiming at different requirements of transmission mode to choose the different network topologies form can most likely reduce the system cost. And aiming at different network to choose the correct ZigBee routing algorithm can effectively reduced the network energy consumption and improved the reliability of the system. Results show that the communication which used ZigBee mode can improve the transmission rate， cover more area and reduce 40% cost compared with traditional wired communications mode.
標(biāo)簽： ZigBee 無(wú)線傳感網(wǎng)絡(luò) 協(xié)議研究 路由
上傳時(shí)間： 2013-10-09
上傳用戶(hù)：robter
同步技術(shù)是跳頻通信系統(tǒng)的關(guān)鍵技術(shù)之一，尤其是在快速跳頻通信系統(tǒng)中，常規(guī)跳頻通信通過(guò)同步字頭攜帶相關(guān)碼的方法來(lái)實(shí)現(xiàn)同步，但對(duì)于快跳頻來(lái)說(shuō)，由于是一跳或者多跳傳輸一個(gè)調(diào)制符號(hào)，難以攜帶相關(guān)碼。對(duì)此引入雙跳頻圖案方法，提出了一種適用于快速跳頻通信系統(tǒng)的同步方案。采用短碼攜帶同步信息，克服了快速跳頻難以攜帶相關(guān)碼的困難。分析了同步性能，仿真結(jié)果表明該方案同步時(shí)間短、虛警概率低、捕獲概率高，同步性能可靠。 Abstract: Synchronization is one of the key techniques to frequency-hopping communication system， especially in the fast frequency hopping communication system. In conventional frequency hopping communication systems， synchronization can be achieved by synchronization-head which can be used to carry the synchronization information， but for the fast frequency hopping， Because modulation symbol is transmitted by per hop or multi-hop， it is difficult to carry the correlation code. For the limitation of fast frequency hopping in carrying correlation code， a fast frequency-hopping synchronization scheme with two hopping patterns is proposed. The synchronization information is carried by short code， which overcomes the difficulty of correlation code transmission in fast frequency-hopping. The performance of the scheme is analyzed， and simulation results show that the scheme has the advantages of shorter synchronization time， lower probability of false alarm， higher probability of capture and more reliable of synchronization.
標(biāo)簽： 快速跳頻 同步技術(shù) 通信系統(tǒng)
上傳時(shí)間： 2013-11-23
上傳用戶(hù)：mpquest
提出了一種以ARM微處理器為控制核心的遠(yuǎn)程無(wú)線視頻監(jiān)控終端的設(shè)計(jì)方案，其監(jiān)控終端的硬件設(shè)計(jì)包括視頻采集處理、中央管理控制、無(wú)線傳輸3個(gè)模塊。并給出了監(jiān)控終端的軟件開(kāi)發(fā)平臺(tái)和開(kāi)發(fā)模式的系統(tǒng)啟動(dòng)代碼、嵌入式Linux系統(tǒng)移植以及驅(qū)動(dòng)程序和應(yīng)用程序。測(cè)試結(jié)果表明，該監(jiān)控終端設(shè)計(jì)方案合理、有效，基本滿(mǎn)足監(jiān)控需求。 Abstract: A remote wireless video monitoring terminal design， which uses ARM microprocessor as its core control， is proposed in this paper.The hardware design of monitoring terminal system is composed of the video acquisition and processing module， the central management and control module， wireless transmission module.Meanwhile the monitoring terminal-s software development platform and development patterns are designed. Also the design of the system-s start codes， embedded Linux system-s transplantation process， driver and the corresponding applications are given. The results showed that the monitoring terminal design is reasonable， effective， basically meet monitoring requirements.
標(biāo)簽： ARM 遠(yuǎn)程無(wú)線 視頻監(jiān)控 終端設(shè)計(jì)
上傳時(shí)間： 2013-11-13
上傳用戶(hù)：wanqunsheng
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