作者:Dominique D. Guinard,Vlad著出版社:電子工業出版社出版日期:2018-01-01索書號:TP393/2752標準編碼:9787121327643 物聯網的潛能絕不止于解決特定場景的小問題,而是用務實|結構化的方法論來構建大型系統、實現創新、重建秩序。√ IoT 離不開更大圖景及完整生態,作者要用超前視野和大局觀,解決無數工具|標準|協議及云服務構成的高度碎片化。√ 易讀到物聯網新手可按圖索驥建立一個完整的端到端物聯網;深刻到創建完所有元素后你已成為熟練的物聯網開發者。 本書是介紹萬維物聯網的入門教材。作者通過將樹莓派作為物理設備網關,提出一種構建萬物互聯的可行方案——利用現有的萬維網標準、協議,以及HTML、CSS 和技術,讓智能產品終端成為開放的萬維網的一部分,終形成物聯網和萬維網的結合體——萬維物聯網。本書分為兩個部分,章到第5 章是第I 部分,內容涵蓋萬維物聯網基本概念、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 框架與遠程設備進行交互。第6 章到0 章是第II 部分,詳細介紹萬維物聯網技術棧中的各層架構及如何用現有的Web 技術實現各層架構,終能夠形成物理網聚合應用,能夠快速創建復雜應用程序,整合各種設備和數據。本書涉獵的技術范圍廣泛,包括各種Web 和物聯網協議、Web 標準及樹莓派的原理與實踐。適合之前沒有豐富嵌入式開發經驗,但希望探索物聯網世界的Web 開發人員閱讀,也適合作為一本初級教程指導樹莓派開發者和node.js 愛好者進行物聯網開發實踐。
上傳時間: 2022-04-28
上傳用戶:
以C8051F020為核心處理器,設計無線傳感器網絡數據采集系統。系統采用SZ05-ADV型無線通訊模塊組建Zigbee無線網絡,結合嵌入式系統的軟硬件技術,完成終端節點的8路傳感器信號的數據采集。現場8路信號通過前端處理后,分別送入C8051F020的12位A/D轉換器進行轉換。經過精確處理、存儲后的現場數據,通過Zigbee無線網絡傳送到上位機,系統可達到汽車試驗中無線測試的目的。 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.
標簽: C8051F020 Zigbee 汽車測試 系統設計
上傳時間: 2013-11-23
上傳用戶:dsgkjgkjg
介紹了CAN總線和P87C591單片機的特點,給出了基于P87C591單片機的信號采集節點的軟、硬件設計,指出了硬件電路設計中應注意的問題,在軟件設計中重點介紹了節點初始化、報文發送和報文接收等子程序。 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.
上傳時間: 2013-11-03
上傳用戶:BIBI
基于幅移鍵控技術ASK(Amplitude-Shift Keying),以C8051F340單片機作為監測終端控制器,C8051F330D單片機作為探測節點控制器,采用半雙工的通信方式,通過監控終端和探測節點的無線收發電路,實現數據的雙向無線傳輸。收發電路采用直徑為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。試驗表明,探測節點與監測終端的通信距離為24 cm,通過橋接方式,節點收發功率為102 mW時,節點間的通信距離可達20 cm。與傳統無線收發模塊相比,該無線收發電路在受體積、功耗、成本限制的場合有廣闊的應用前景。 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.
上傳時間: 2013-10-19
上傳用戶:xz85592677
基于P87 C591的CAN總線系統智能節點設計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的智能節點的硬件電路及軟件結構,詳細介紹了設計中的難點及實現過程中應注意的問題。關鍵詞:CAN總線;智能節點 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80年代初為解決現代汽車中眾多的控制與測試儀器之間的數據交換而開發的一種串行數據通信協議,它是一種多主總線,通信介質可以是雙絞線、同軸電纜或光導纖維。由于CAN總線具有較強的糾錯能力,支持差分收發,因而適合高噪聲環境。并具有較遠的傳輸距離,適用于許多領域的分布式測控系統。目前已在工業自動化、建筑物環境控制、醫療設備等許多領域得到廣泛的應用。CAN已成為國際標準化組織IS011898標準。
上傳時間: 2013-10-30
上傳用戶:xymbian
CAN與RS232轉換節點的設計與實現 介紹將CAN總線接口與RS232總線接口相互轉換的設計方法和2種總線電平轉換關系,實現CAN總線與各模塊的接口設計,制定了相應的軟硬件設計方案,并給出軟件設計流程圖以及部分硬件設計原理圖。為CAN總線與RS232總線互聯提供了一種方法,對CAN總線與RS232總線接口設備的互聯和廣泛應用的實現具有重要意義。關鍵詞: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
上傳時間: 2013-11-04
上傳用戶:leesuper
關于3g無線網優的:WCDMA無線基本原理 課程目標: ? 掌握3G移動通信的基本概念 ? 掌握3G的標準化過程 ? 掌握WCDMA的基本網絡結構以及各網元功能 ? 掌握無線通信原理 ? 掌握WCDMA的關鍵技術 參考資料: ? 《3G概述與概況》 ? 《中興通訊WCDMA基本原理》 ? 《ZXWR RNC(V3.0)技術手冊》 ? 《ZXWR NB09技術手冊》 第1章 概述 1 1.1 移動通信的發展歷程 1 1.1.1 移動通信系統的發展 1 1.1.2 移動通信用戶及業務的發展 1 1.2 3G移動通信的概念 2 1.3 為什么要發展第三代移動通信 2 1.4 3G的標準化過程 3 1.4.1 標準組織 3 1.4.2 3G技術標準化 3 1.4.3 第三代的核心網絡 4 1.4.4 IMT-2000的頻譜分配 6 1.4.5 2G向3G移動通信系統演進 7 1.4.6 WCDMA核心網絡結構的演進 11 第2章 WCDMA系統介紹 13 2.1 系統概述 13 2.2 R99網元和接口概述 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 網關GMSC 16 2.2.4 GPRS業務支持節點SGSN 16 2.2.5 網關GPRS支持節點GGSN 17 2.2.6 歸屬位置寄存器與鑒權中心HLR/AuC 17 2.2.7 移動設備識別寄存器EIR 17 2.3 R4網絡結構概述 17 2.3.1 媒體網關MGW 19 2.3.2 傳輸信令網關T-SGW、漫游信令網關R-SGW 20 2.4 R5網絡結構概述 20 2.4.1 媒體網關控制器MGCF 22 2.4.2 呼叫控制網關CSCF 22 2.4.3 會議電話橋分MRF 22 2.4.4 歸屬用戶服務器HSS 22 2.5 UTRAN的一般結構 22 2.5.1 RNC子系統 23 2.5.2 node B子系統 25 第3章 擴頻通信原理 27 3.1 擴頻通信簡介 27 3.1.1 擴頻技術簡介 27 3.1.2 擴頻技術的現狀 27 3.2 擴頻通信原理 28 3.2.1 擴頻通信的定義 29 3.2.2 擴頻通信的理論基礎 29 3.2.3 擴頻與解擴頻過程 30 3.2.4 擴頻增益和抗干擾容限 31 3.2.5 擴頻通信的主要特點 32 第4章 無線通信基礎 35 4.1 移動無線信道的特點 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 42 4.3 擴頻碼與擾碼 44 4.4 調制 47 第5章 WCDMA關鍵技術 49 5.1 WCDMA系統的技術特點 49 5.2 功率控制 51 5.2.1 開環功率控制 51 5.2.2 閉環功率控制 52 5.2.3 HSDPA相關的功率控制 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 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 基于負荷控制原因觸發的切換 73 6.1.4 基于覆蓋原因觸發的切換 74 6.1.5 基于負荷均衡原因觸發的切換 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據采集的復雜性,設計了一種基于以太網分布式的數據采集控制系統,該系統是RCM5700微處理器模塊上的以太網應用。在系統的基礎上具體討論了PoE技術的應用,在傳輸數據的網線上同時提供電流,提出并實現了一種包括輔助電源在內的完整可靠的PoE供電方案。設計采用美國國家半導體的LM5073和LM5576并根據不同的負載情況,進行穩定可靠的電壓轉換,以滿足數據采集電路的要求。實驗結果表明:該設計穩定可靠,滿足低于13 W的采集節點供電要求,提高了模擬器信號采集系統的通用性和標準化程度,避免了以往數據采集節點單獨繁瑣的電源設計。 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.
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藍莓汁
在研究傳統家用燃氣報警器的基礎上,以ZigBee協議為平臺,構建mesh網狀網絡實現網絡化的智能語音報警系統。由于傳感器本身的溫度和實際環境溫度的影響,傳感器標定后采用軟件補償方法。為了減少系統費用,前端節點采用半功能節點設備,路由器和協調器采用全功能節點設備,構建mesh網絡所形成的家庭內部報警系統,通過通用的電話接口連接到外部的公用電話網絡,啟動語音模塊進行報警。實驗結果表明,在2.4 GHz頻率下傳輸,有墻等障礙物的情況下,節點的傳輸距離大約為35 m,能夠滿足家庭需要,且系統工作穩定,但在功耗方面仍需進一步改善。 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.
上傳時間: 2013-10-30
上傳用戶:swaylong