首先介紹了無線傳感器網(wǎng)絡(luò)的基本拓?fù)浣Y(jié)構(gòu)與傳感器節(jié)點(diǎn)的結(jié)構(gòu),詳細(xì)說明了基于ZigBee協(xié)議棧的無線傳感網(wǎng)絡(luò)的建立過程,包括協(xié)調(diào)器啟動(dòng)及建立網(wǎng)絡(luò)、傳感器節(jié)點(diǎn)啟動(dòng)及加入網(wǎng)絡(luò)、傳感器節(jié)點(diǎn)與協(xié)調(diào)器之間建立綁定以及傳感器節(jié)點(diǎn)向協(xié)調(diào)器發(fā)送數(shù)據(jù)的過程。設(shè)計(jì)了基于ZigBee協(xié)議棧的無線傳感網(wǎng)絡(luò)系統(tǒng)。以采集溫度信息為例,協(xié)調(diào)器能夠接收到傳感器節(jié)點(diǎn)發(fā)來的數(shù)據(jù),并能通過RS232串口,將收到的數(shù)據(jù)發(fā)送給PC機(jī)進(jìn)行顯示。實(shí)驗(yàn)顯示在距離80 m遠(yuǎn)處,系統(tǒng)仍能保持良好的通信質(zhì)量。
標(biāo)簽: ZigBee 協(xié)議棧 無線傳感器網(wǎng)絡(luò)
上傳時(shí)間: 2013-10-30
上傳用戶:truth12
提出了一種基于PIC16F877A微控制器和CC2500射頻收發(fā)器芯片的低功耗、低成本RFID(Radio Frequency Identification, 無線射頻識(shí)別)局域定位系統(tǒng)設(shè)計(jì)方法,介紹了系統(tǒng)的定位工作原理、主要硬件電路模塊及定位算法的設(shè)計(jì)和實(shí)現(xiàn)。采用基于序列號(hào)對(duì)時(shí)隙數(shù)運(yùn)算的排序算法有效解決了多標(biāo)簽識(shí)別碰撞的問題,基于射頻輻射強(qiáng)度(Received Signal Strength Indication, RSSI)和圓周定位算法實(shí)現(xiàn)了基于RFID多標(biāo)簽系統(tǒng)的平面定位。實(shí)驗(yàn)測(cè)試表明,這種射頻定位方法能夠?qū)崿F(xiàn)一定精度下的無線局域定位的功能。
上傳時(shí)間: 2013-11-06
上傳用戶:weareno2
介紹了基一種基于ZigBee和ARM技術(shù)的無線森林火情監(jiān)測(cè)系統(tǒng)。該系統(tǒng)采用無線傳感網(wǎng)絡(luò)結(jié)合上位機(jī)數(shù)據(jù)處理中心的框架,采取ZigBee和短波無線通信方案,融合了傳感器網(wǎng)絡(luò)、ARM等工控技術(shù),實(shí)現(xiàn)了森林環(huán)境參數(shù)采集和傳輸。在系統(tǒng)的總體框架下,重點(diǎn)分析了ZigBee組網(wǎng)的的設(shè)計(jì)方案,包括軟件設(shè)計(jì)和硬件設(shè)計(jì)。最后,對(duì)節(jié)點(diǎn)性能和整個(gè)監(jiān)控系統(tǒng)進(jìn)行了測(cè)試,證明了系統(tǒng)的穩(wěn)定性和其數(shù)據(jù)傳輸?shù)目煽啃浴?
標(biāo)簽: ZigBee ARM 火情監(jiān)測(cè)
上傳時(shí)間: 2013-11-12
上傳用戶:zjc0413
基于PLC與無線通訊模塊相結(jié)合的路燈控制方案,采用了組態(tài)軟件、PLC控制模塊、單片機(jī)采集模塊、GRPS通信模塊、ZigBee無線模塊等技術(shù),靈活控制路燈的工作狀態(tài),為路燈照明系統(tǒng)提供穩(wěn)定、可靠、低成本的實(shí)施方案,不僅大大節(jié)約了鋪設(shè)通信電纜的費(fèi)用,而且達(dá)到了節(jié)能的目的。
上傳時(shí)間: 2014-04-24
上傳用戶:Breathe0125
文中通過對(duì)校園Rfid-sim卡手機(jī)項(xiàng)目建設(shè)與校園應(yīng)用系統(tǒng)對(duì)接的經(jīng)驗(yàn)和體會(huì),分析了校園數(shù)據(jù)相互關(guān)系,提出了系統(tǒng)對(duì)接內(nèi)容及方法。
標(biāo)簽: Rfid-sim 手機(jī) 應(yīng)用系統(tǒng) 對(duì)接
上傳時(shí)間: 2013-11-03
上傳用戶:whymatalab2
該系統(tǒng)以計(jì)算機(jī)為依托構(gòu)建中央信息處理系統(tǒng)CIPS(Central Information Processing System),以Pocket PC作為巡檢終端PS(Portable Station),采用SQL Server 2000關(guān)系型數(shù)據(jù)庫和SQL Server CE3.0嵌入式數(shù)據(jù)庫技術(shù),集RFID技術(shù)、GPS定位技術(shù)、信息管理、信息傳輸?shù)榷囗?xiàng)技術(shù)于一體,完成信息在CIPS和PS之間的交互,實(shí)現(xiàn)巡檢信息的綜合處理。
標(biāo)簽: RFID GPS 智能巡檢系統(tǒng)
上傳時(shí)間: 2013-11-16
上傳用戶:stvnash
通過這種證書的添加,RFID服務(wù)器可方便、安全地標(biāo)識(shí)和識(shí)別目的RFID設(shè)備,并且可以通過證書的使用,使RFID設(shè)備對(duì)其他的惡意讀寫操作采取“靜默”,以減少非法訪問。
上傳時(shí)間: 2013-11-03
上傳用戶:zhangxin
Radio Frequency Identifi cation (RFID) technology usesradiated and refl ected RF power to identify and track avariety of objects. A typical RFID system consists of areader and a transponder (or tag). An RFID reader containsan RF transmitter, one or more antennas and an RFreceiver. An RFID tag is simply an uniquely identifi ed ICwith an antenna.
上傳時(shí)間: 2013-10-17
上傳用戶:lepoke
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),通過通用的電話接口連接到外部的公用電話網(wǎng)絡(luò),啟動(dòng)語音模塊進(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 無線智能 家 報(bào)警系統(tǒng)
上傳時(shí)間: 2013-10-30
上傳用戶:swaylong
為滿足無線網(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)器組成的無線傳感節(jié)點(diǎn)。通過分析其節(jié)點(diǎn)組成,提出了ZigBee技術(shù)中的幾種網(wǎng)絡(luò)拓?fù)湫问剑⒀芯苛薢igBee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:robter
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