作者:Dominique D. Guinard,Vlad著出版社:電子工業(yè)出版社出版日期:2018-01-01索書號:TP393/2752標(biāo)準(zhǔn)編碼:9787121327643 物聯(lián)網(wǎng)的潛能絕不止于解決特定場景的小問題,而是用務(wù)實(shí)|結(jié)構(gòu)化的方法論來構(gòu)建大型系統(tǒng)、實(shí)現(xiàn)創(chuàng)新、重建秩序。√ IoT 離不開更大圖景及完整生態(tài),作者要用超前視野和大局觀,解決無數(shù)工具|標(biāo)準(zhǔn)|協(xié)議及云服務(wù)構(gòu)成的高度碎片化。√ 易讀到物聯(lián)網(wǎng)新手可按圖索驥建立一個完整的端到端物聯(lián)網(wǎng);深刻到創(chuàng)建完所有元素后你已成為熟練的物聯(lián)網(wǎng)開發(fā)者。 本書是介紹萬維物聯(lián)網(wǎng)的入門教材。作者通過將樹莓派作為物理設(shè)備網(wǎng)關(guān),提出一種構(gòu)建萬物互聯(lián)的可行方案——利用現(xiàn)有的萬維網(wǎng)標(biāo)準(zhǔn)、協(xié)議,以及HTML、CSS 和技術(shù),讓智能產(chǎn)品終端成為開放的萬維網(wǎng)的一部分,終形成物聯(lián)網(wǎng)和萬維網(wǎng)的結(jié)合體——萬維物聯(lián)網(wǎng)。本書分為兩個部分,章到第5 章是第I 部分,內(nèi)容涵蓋萬維物聯(lián)網(wǎng)基本概念、和node.js 介紹,通過一個簡單的例子來說明如何使用node.js 的Web 框架與遠(yuǎn)程設(shè)備進(jìn)行交互。第6 章到0 章是第II 部分,詳細(xì)介紹萬維物聯(lián)網(wǎng)技術(shù)棧中的各層架構(gòu)及如何用現(xiàn)有的Web 技術(shù)實(shí)現(xiàn)各層架構(gòu),終能夠形成物理網(wǎng)聚合應(yīng)用,能夠快速創(chuàng)建復(fù)雜應(yīng)用程序,整合各種設(shè)備和數(shù)據(jù)。本書涉獵的技術(shù)范圍廣泛,包括各種Web 和物聯(lián)網(wǎng)協(xié)議、Web 標(biāo)準(zhǔn)及樹莓派的原理與實(shí)踐。適合之前沒有豐富嵌入式開發(fā)經(jīng)驗(yàn),但希望探索物聯(lián)網(wǎng)世界的Web 開發(fā)人員閱讀,也適合作為一本初級教程指導(dǎo)樹莓派開發(fā)者和node.js 愛好者進(jìn)行物聯(lián)網(wǎng)開發(fā)實(shí)踐。
標(biāo)簽: node.js 樹莓派 物聯(lián)網(wǎng)
上傳時間: 2022-04-28
上傳用戶:
以C8051F020為核心處理器,設(shè)計(jì)無線傳感器網(wǎng)絡(luò)數(shù)據(jù)采集系統(tǒng)。系統(tǒng)采用SZ05-ADV型無線通訊模塊組建Zigbee無線網(wǎng)絡(luò),結(jié)合嵌入式系統(tǒng)的軟硬件技術(shù),完成終端節(jié)點(diǎn)的8路傳感器信號的數(shù)據(jù)采集。現(xiàn)場8路信號通過前端處理后,分別送入C8051F020的12位A/D轉(zhuǎn)換器進(jìn)行轉(zhuǎn)換。經(jīng)過精確處理、存儲后的現(xiàn)場數(shù)據(jù),通過Zigbee無線網(wǎng)絡(luò)傳送到上位機(jī),系統(tǒng)可達(dá)到汽車試驗(yàn)中無線測試的目的。 Abstract: This paper designs a wireless sensor network system for data acquisition with C8051F020 as core processors.The system used SZ05-ADV wireless communication module,set up a Zigbee wireless network, combined with hardware and software technologies of embedded systems,completed the end-node 8-locale sensor signal data acquisition.Eight locale signals were sent separately into the 12-bit ADC of C8051F020 for conversion through front treatment.After accurate processing and storage,the locale data was transmitted to the host computer through Zigbee wireless.The system achieves the purpose of wireless testing in vehicle trial.
標(biāo)簽: C8051F020 Zigbee 汽車測試 系統(tǒng)設(shè)計(jì)
上傳時間: 2013-11-23
上傳用戶:dsgkjgkjg
介紹了CAN總線和P87C591單片機(jī)的特點(diǎn),給出了基于P87C591單片機(jī)的信號采集節(jié)點(diǎn)的軟、硬件設(shè)計(jì),指出了硬件電路設(shè)計(jì)中應(yīng)注意的問題,在軟件設(shè)計(jì)中重點(diǎn)介紹了節(jié)點(diǎn)初始化、報(bào)文發(fā)送和報(bào)文接收等子程序。 Abstract: The features of CAN Bus and the microcontroller P87C591 are introduced, and the design of hardware circuit and soft configuration of the signals collection node based on P87C591 are presented. The problems in designing hardware circuit are discussed.Initialization subprogram, transmiting subprogram and receiving subprogram are emphasized in soft configuration.
標(biāo)簽: P87C591 信號采集 節(jié)點(diǎn)
上傳時間: 2013-11-03
上傳用戶:BIBI
基于幅移鍵控技術(shù)ASK(Amplitude-Shift Keying),以C8051F340單片機(jī)作為監(jiān)測終端控制器,C8051F330D單片機(jī)作為探測節(jié)點(diǎn)控制器,采用半雙工的通信方式,通過監(jiān)控終端和探測節(jié)點(diǎn)的無線收發(fā)電路,實(shí)現(xiàn)數(shù)據(jù)的雙向無線傳輸。收發(fā)電路采用直徑為0.8 mm的漆包線自行繞制成圓形空心線圈天線,天線直徑為(3.4±0.3)cm。試驗(yàn)表明,探測節(jié)點(diǎn)與監(jiān)測終端的通信距離為24 cm,通過橋接方式,節(jié)點(diǎn)收發(fā)功率為102 mW時,節(jié)點(diǎn)間的通信距離可達(dá)20 cm。與傳統(tǒng)無線收發(fā)模塊相比,該無線收發(fā)電路在受體積、功耗、成本限制的場合有廣闊的應(yīng)用前景。 Abstract: Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller, using half-duplex communication mode, this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter (3.4±0.3) cm circular hollow coil antenna. Tests show that the communication distance between detection and monitoring of the terminal is 24cm,the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules, the circuit has wide application prospect in small size, low cost and low power consumption and other characteristics.
標(biāo)簽: C8051F 單片機(jī) 無線收發(fā) 電路設(shè)計(jì)
上傳時間: 2013-10-19
上傳用戶:xz85592677
基于P87 C591的CAN總線系統(tǒng)智能節(jié)點(diǎn)設(shè)計(jì)Design of CAN System Intelligent node Based on P87C591 給出了基于帶CAN控制器的單片8位微控制器P87C591的智能節(jié)點(diǎn)的硬件電路及軟件結(jié)構(gòu),詳細(xì)介紹了設(shè)計(jì)中的難點(diǎn)及實(shí)現(xiàn)過程中應(yīng)注意的問題。關(guān)鍵詞:CAN總線;智能節(jié)點(diǎn) Abstract:A h ardc ircuita nds oftw arec onfigurationo fth ei ntelligentnode based on a microcontroller with CAN controller P87C591 arepresented.E speciallyt hec ruxi nd esigninga ndt hep roblemst hatshould be paid attention in realizing are discussed in details.Keyw ords:C AN;in telligentn ode CA N 總線 是德國Bosch從20世紀(jì)80年代初為解決現(xiàn)代汽車中眾多的控制與測試儀器之間的數(shù)據(jù)交換而開發(fā)的一種串行數(shù)據(jù)通信協(xié)議,它是一種多主總線,通信介質(zhì)可以是雙絞線、同軸電纜或光導(dǎo)纖維。由于CAN總線具有較強(qiáng)的糾錯能力,支持差分收發(fā),因而適合高噪聲環(huán)境。并具有較遠(yuǎn)的傳輸距離,適用于許多領(lǐng)域的分布式測控系統(tǒng)。目前已在工業(yè)自動化、建筑物環(huán)境控制、醫(yī)療設(shè)備等許多領(lǐng)域得到廣泛的應(yīng)用。CAN已成為國際標(biāo)準(zhǔn)化組織IS011898標(biāo)準(zhǔn)。
標(biāo)簽: P87C591 CAN 總線系統(tǒng) 智能節(jié)點(diǎn)
上傳時間: 2013-10-30
上傳用戶:xymbian
CAN與RS232轉(zhuǎn)換節(jié)點(diǎn)的設(shè)計(jì)與實(shí)現(xiàn) 介紹將CAN總線接口與RS232總線接口相互轉(zhuǎn)換的設(shè)計(jì)方法和2種總線電平轉(zhuǎn)換關(guān)系,實(shí)現(xiàn)CAN總線與各模塊的接口設(shè)計(jì),制定了相應(yīng)的軟硬件設(shè)計(jì)方案,并給出軟件設(shè)計(jì)流程圖以及部分硬件設(shè)計(jì)原理圖。為CAN總線與RS232總線互聯(lián)提供了一種方法,對CAN總線與RS232總線接口設(shè)備的互聯(lián)和廣泛應(yīng)用的實(shí)現(xiàn)具有重要意義。關(guān)鍵詞:CAN總線;RS-232總線;串行通信Design and Realization of CAN and RS232 Transformation nodeZHOU Wei, CHENG Xiao-hong(Information Institute, Wuhan University of Technology, Wuhan 430070)【Abstract】This paper introduces one design method of the CAN bus interface and the RS232 bus interface interconversion, emphasizes two kindof bus level transformation relations, realizes the CAN bus and various modules connection design, formulates the design proposal of correspondingsoftware and hardware, and gives the flow chart of software design as well as the partial schematic diagram of hardware design. It providesonemethod for the CAN bus and the RS232 bus interconnection, has the vital significance to widespread application realization of the CAN busand theRS232 bus interface equipment interconnection.【Key words】CAN bus; RS-232 bus; serial communication
標(biāo)簽: CAN 232 RS 轉(zhuǎn)換
上傳時間: 2013-11-04
上傳用戶:leesuper
關(guān)于3g無線網(wǎng)優(yōu)的:WCDMA無線基本原理 課程目標(biāo): ? 掌握3G移動通信的基本概念 ? 掌握3G的標(biāo)準(zhǔn)化過程 ? 掌握WCDMA的基本網(wǎng)絡(luò)結(jié)構(gòu)以及各網(wǎng)元功能 ? 掌握無線通信原理 ? 掌握WCDMA的關(guān)鍵技術(shù) 參考資料: ? 《3G概述與概況》 ? 《中興通訊WCDMA基本原理》 ? 《ZXWR RNC(V3.0)技術(shù)手冊》 ? 《ZXWR NB09技術(shù)手冊》 第1章 概述 1 1.1 移動通信的發(fā)展歷程 1 1.1.1 移動通信系統(tǒng)的發(fā)展 1 1.1.2 移動通信用戶及業(yè)務(wù)的發(fā)展 1 1.2 3G移動通信的概念 2 1.3 為什么要發(fā)展第三代移動通信 2 1.4 3G的標(biāo)準(zhǔn)化過程 3 1.4.1 標(biāo)準(zhǔn)組織 3 1.4.2 3G技術(shù)標(biāo)準(zhǔn)化 3 1.4.3 第三代的核心網(wǎng)絡(luò) 4 1.4.4 IMT-2000的頻譜分配 6 1.4.5 2G向3G移動通信系統(tǒng)演進(jìn) 7 1.4.6 WCDMA核心網(wǎng)絡(luò)結(jié)構(gòu)的演進(jìn) 11 第2章 WCDMA系統(tǒng)介紹 13 2.1 系統(tǒng)概述 13 2.2 R99網(wǎng)元和接口概述 14 2.2.1 移動交換中心MSC 16 2.2.2 拜訪位置寄存器VLR 16 2.2.3 網(wǎng)關(guān)GMSC 16 2.2.4 GPRS業(yè)務(wù)支持節(jié)點(diǎn)SGSN 16 2.2.5 網(wǎng)關(guān)GPRS支持節(jié)點(diǎn)GGSN 17 2.2.6 歸屬位置寄存器與鑒權(quán)中心HLR/AuC 17 2.2.7 移動設(shè)備識別寄存器EIR 17 2.3 R4網(wǎng)絡(luò)結(jié)構(gòu)概述 17 2.3.1 媒體網(wǎng)關(guān)MGW 19 2.3.2 傳輸信令網(wǎng)關(guān)T-SGW、漫游信令網(wǎng)關(guān)R-SGW 20 2.4 R5網(wǎng)絡(luò)結(jié)構(gòu)概述 20 2.4.1 媒體網(wǎng)關(guān)控制器MGCF 22 2.4.2 呼叫控制網(wǎng)關(guān)CSCF 22 2.4.3 會議電話橋分MRF 22 2.4.4 歸屬用戶服務(wù)器HSS 22 2.5 UTRAN的一般結(jié)構(gòu) 22 2.5.1 RNC子系統(tǒng) 23 2.5.2 node B子系統(tǒng) 25 第3章 擴(kuò)頻通信原理 27 3.1 擴(kuò)頻通信簡介 27 3.1.1 擴(kuò)頻技術(shù)簡介 27 3.1.2 擴(kuò)頻技術(shù)的現(xiàn)狀 27 3.2 擴(kuò)頻通信原理 28 3.2.1 擴(kuò)頻通信的定義 29 3.2.2 擴(kuò)頻通信的理論基礎(chǔ) 29 3.2.3 擴(kuò)頻與解擴(kuò)頻過程 30 3.2.4 擴(kuò)頻增益和抗干擾容限 31 3.2.5 擴(kuò)頻通信的主要特點(diǎn) 32 第4章 無線通信基礎(chǔ) 35 4.1 移動無線信道的特點(diǎn) 35 4.1.1 概述 35 4.1.2 電磁傳播的分析 37 4.2 編碼與交織 38 4.2.1 信道編碼 39 4.2.2 交織技術(shù) 42 4.3 擴(kuò)頻碼與擾碼 44 4.4 調(diào)制 47 第5章 WCDMA關(guān)鍵技術(shù) 49 5.1 WCDMA系統(tǒng)的技術(shù)特點(diǎn) 49 5.2 功率控制 51 5.2.1 開環(huán)功率控制 51 5.2.2 閉環(huán)功率控制 52 5.2.3 HSDPA相關(guān)的功率控制 55 5.3 RAKE接收 57 5.4 多用戶檢測 60 5.5 智能天線 62 5.6 分集技術(shù) 64 第6章 WCDMA無線資源管理 67 6.1 切換 67 6.1.1 切換概述 67 6.1.2 切換算法 73 6.1.3 基于負(fù)荷控制原因觸發(fā)的切換 73 6.1.4 基于覆蓋原因觸發(fā)的切換 74 6.1.5 基于負(fù)荷均衡原因觸發(fā)的切換 77 6.1.6 基于移動臺移動速度的切換 79 6.2 碼資源管理 80 6.2.1 上行擾碼 80 6.2.2 上行信道化碼 83 6.2.3 下行擾碼 84 6.2.4 下行信道化碼 85 6.3 接納控制 89 6.4 負(fù)荷控制 95 第7章 信道 97 7.1 UTRAN的信道 97 7.1.1 邏輯信道 98 7.1.2 傳輸信道 99 7.1.3 物理信道 101 7.1.4 信道映射 110 7.2 初始接入過程 111 7.2.1 小區(qū)搜索過程 111 7.2.2 初始接入過程 112
上傳時間: 2013-11-21
上傳用戶:tdyoung
針對飛行模擬器座艙數(shù)據(jù)采集的復(fù)雜性,設(shè)計(jì)了一種基于以太網(wǎng)分布式的數(shù)據(jù)采集控制系統(tǒng),該系統(tǒng)是RCM5700微處理器模塊上的以太網(wǎng)應(yīng)用。在系統(tǒng)的基礎(chǔ)上具體討論了PoE技術(shù)的應(yīng)用,在傳輸數(shù)據(jù)的網(wǎng)線上同時提供電流,提出并實(shí)現(xiàn)了一種包括輔助電源在內(nèi)的完整可靠的PoE供電方案。設(shè)計(jì)采用美國國家半導(dǎo)體的LM5073和LM5576并根據(jù)不同的負(fù)載情況,進(jìn)行穩(wěn)定可靠的電壓轉(zhuǎn)換,以滿足數(shù)據(jù)采集電路的要求。實(shí)驗(yàn)結(jié)果表明:該設(shè)計(jì)穩(wěn)定可靠,滿足低于13 W的采集節(jié)點(diǎn)供電要求,提高了模擬器信號采集系統(tǒng)的通用性和標(biāo)準(zhǔn)化程度,避免了以往數(shù)據(jù)采集節(jié)點(diǎn)單獨(dú)繁瑣的電源設(shè)計(jì)。 Abstract: Aiming at the complexity of large avion simulation and controlling,the simulator cabin distribute data collecting and control system was designed. This system is the application of RCM5700 on Ethernet. Based on this system,PoE technique that makes Ethernet can also provide power were expounded with emphasis and included FAUX design the PoE resolution was realized. To achieve the requirement of this system,LM5073 and LM5576 were used to DC-DC switch. From the data of experiment,the design filled the requirement of power-need of node whose power was lower than 13W. The application of the technique can advance the degree of simulation data collections currency and standardization and avoid designing additional power system.
標(biāo)簽: 以太網(wǎng) 分布式 數(shù)據(jù)采集 控制系統(tǒng)
上傳時間: 2013-11-09
上傳用戶:xyipie
The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic devices which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The bit rate for normal communications is typically 33 kbit/s, forhigh-speed transmissions like described above a typical bit rate of83 kbit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.
上傳時間: 2013-10-24
上傳用戶:s藍(lán)莓汁
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,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)
上傳時間: 2013-10-30
上傳用戶:swaylong
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