We are in the era of ubiquitous computing in which the use and development of Radio Frequency Iden- tification (RFID) is becoming more widespread. RFID systems have three main components: readers, tags, and database. An RFID tag is composed of a small microchip, limited logical functionality, and an antenna. Most common tags are passive and harvest energy from a nearby RFID reader. This energy is used both to energize the chip and send the answer back to the reader request. The tag provides a unique identifier (or an anonymized Version of that), which allows the unequivocal identification of the tag holder (i.e. person, animal, or items).
標(biāo)簽： Identification Wireless
上傳時間： 2020-06-08
上傳用戶：shancjb
Sound is simply an airborne Version of vibration. The air which carries sound is a mixture of gases. In gases, the molecules contain so much energy that they break free from their neighbors and rush around at high speed. As Figure 1.1(a) shows, the innumerable elastic collisions of these high-speed molecules produce pressure on the walls of any gas container. If left undisturbed in a container at a constant temperature, eventually the pressure throughout would be constant and uniform.
標(biāo)簽： Engineering Audio
上傳時間： 2020-06-09
上傳用戶：shancjb
An Arduino core for the ATmega328, ATmega168, ATmega88, ATmega48 and ATmega8, all running a [custom Version of Optiboot for increased functionality](#write-to-own-flash). This core requires at least Arduino IDE v1.6.2, where v1.8.5+ is recommended. <br/> **This core gives you two extra IO pins if you're using the internal oscillator!** PB6 and PB7 is mapped to [Arduino pin 20 and 21](#pinout).<br/> If you're into "generic" AVR programming, I'm happy to tell you that all relevant keywords are being highlighted by the IDE through a separate keywords file. Make sure to test the [example files](https://github.com/MCUdude/MiniCore/tree/master/avr/libraries/AVR_examples/examples) (File > Examples > AVR C code examples). Try writing a register name, <i>DDRB</i> for instance, and see for yourself!
標(biāo)簽： MiniCore
上傳時間： 2021-02-22
上傳用戶：
專業(yè)計算衰減器衰減量，空心電感感值，幅度均衡計算，分值分配，微帶線計算，電纜阻抗計算，還有工程常量
標(biāo)簽： 衰減器
上傳時間： 2021-11-12
上傳用戶：xsr1983
The PW2053 is a high-efficiency monolithic synchronous buck regulator using a constantfrequency, current mode architecture. The device is available in an adjustable Version. Supply currentwith no load is 40uA and drops to <1uA in shutdown. The 2.5V to 5.5V input voltage range makesthe PW2053 ideally suited for single Li-Ion battery powered applications. 100% duty cycle provideslow dropout operation, extending battery life in portable systems. PWM/PFM mode operationprovides very low output ripple voltage for noise sensitive applications. Switching frequency isinternally set at 1.2MHz, allowing the use of small surface mount inductors and capacitors. Lowoutput voltages are easily supported with the 0.6V feedback reference voltage
標(biāo)簽： pw2053
上傳時間： 2022-02-14
上傳用戶：jason_vip1
高清電子書-C++ Primer Plus, 第6版英文版 1438頁Learning C++ is an adventure of discovery, particularly because the language accommodates several programming paradigms, including object-oriented programming, generic programming, and the traditional procedural programming.The fifth edition of this book described the language as set forth in the ISO C++ standards, informally known as C++99 and C++03, or, sometimes as C++99/03. (The 2003 Version was largely a technical correction to the 1999 standard and didn’t add any new features.) Since then, C++ continues to evolve.As this book is written, the international C++ Standards Committee has just approved a new Version of the standard.This standard had the informal name of C++0x while in development, and now it will be known as C++11. Most contemporary compilers support C++99/03 quite well, and most of the examples in this book comply with that standard. But many features of the new standard already have appeared in some implementations, and this edition of C++ Primer Plus explores these new features. C++ Primer Plus discusses the basic C language and presents C++ features, making this book self-contained. It presents C++ fundamentals and illustrates them with short, to-the-point programs that are easy to copy and experiment with.You learn about input/output (I/O), how to make programs perform repetitive tasks and make choices, the many ways to handle data, and how to use functions.You learn about the many features C++ has added to C, including the followi
標(biāo)簽： C++
上傳時間： 2022-02-19
上傳用戶：trh505
CPCI_E標(biāo)準(zhǔn)規(guī)范 CompactPCI? Express SpecificationThe documents in this section may be useful for reference when reading the specification. The revision listed for each document is the latest revision at the time this specification was published. Newer revisions of these documents may exist, so refer to the newest revision. Many of these documents are referenced throughout this specification. Refer to the newest revision of the document unless a specific revision is referenced. ? PCI Express Base Specification 3.0. PCI Special Interest Group (PCI-SIG). ? PCI Express Card Electromechanical (CEM) Specification 3.0. PCI Special Interest Group (PCI-SIG). ? PCI Express to PCI/PCI-X Bridge Specification, Rev. 1.0. PCI Special Interest Group (PCI-SIG). ? PCI Express Jitter White Paper. PCI Special Interest Group (PCI-SIG). ? PCIe Rj Dj BER White Paper. PCI Special Interest Group (PCI-SIG). ? PHY Electrical Test Specification for PCI Express Architecture. PCI Special Interest Group (PCI SIG). ? System Management Bus (SMBus) Specification, Version 2.0. Smart Battery System Implementer’
標(biāo)簽： CPCIE
上傳時間： 2022-02-23
上傳用戶：
學(xué)習(xí)本章要達到的目標(biāo)：口1.理解 Linux內(nèi)核編譯選項的含義口2.學(xué)會根據(jù)不同的硬件配置裁減定制內(nèi)核；口3.理解內(nèi)核編譯過程中每一步的功能，并編譯 Linux2.630內(nèi)核。需要去重新編譯 Linux內(nèi)核口增加操作系統(tǒng)對新的硬件設(shè)備的支持口增加內(nèi)核新的功能口對內(nèi)核代碼或內(nèi)核配置進行優(yōu)化時Prompt for development and/or incomplete code/drivers口顯示處于開發(fā)調(diào)試中或尚未完善的代碼或驅(qū)口選中：如果是測試人員或者開發(fā)者；口不選：其他情況Local Version append to kerne release口追加本地版本號口使用命令“uname-a”進行查看。POSIX Message Queues口 POSIX消息隊列的支持，這是 POSIX進程間通信的一部分BSD Process Accounting口將進程的統(tǒng)計信息寫入文件口信息通常包括建立時間、所有者、命令名稱、內(nèi)存使用、控制終端等，這個選項一般是選擇的。Enable loadable module support口使能可加載模塊支持口如果使能此選項則可以通過"makemodules_insta"把內(nèi)核模塊安裝在/lib/modules/中Kernel support for ELF binaries口內(nèi)核對ELF文件格式的支持口ELF是開放平臺下最常用的二進制文件格式支持動態(tài)連接，支持不同的硬件平臺Kernel support for a out and ECOFF binaries口早期UNIX系統(tǒng)的可執(zhí)行文件格式，目前已經(jīng)被ELF格式取代Unix domain sockets口本機高效率的 Socket口僅能運行在本機上的高效率的 Socket，簡稱 Unix socket?？诤芏噙M程使用為這種機制在操作系統(tǒng)內(nèi)部進行進程間通信，例如 X Window和 syslog等TCP/IP networking口TcP/IP網(wǎng)絡(luò)協(xié)議的支持
標(biāo)簽： linux
上傳時間： 2022-03-29
上傳用戶：kingwide
第一章移植內(nèi)核1.Linux內(nèi)核基礎(chǔ)知識在動手進行 Linux內(nèi)核移植之前，非常有必要對 Linux內(nèi)核進行一定的了解下面從 Linux內(nèi)核的版本和分類說起1.L.I Linux版本Linux內(nèi)核的版本號可以從源代碼的頂層目錄下的 Makefile中看到，比如2.6.29.1內(nèi)核的 Makefile中：其中的 Version和 PATCHLEVELI組成主版本號，比如24、2.526等，穩(wěn)定版本的德主版本號用偶數(shù)表示（比如26的內(nèi)核），開發(fā)中的版本號用奇數(shù)表示（比如25），它是下一個穩(wěn)定版本內(nèi)核的前身。SUBLEVEL稱為次版本號，它不分奇偶，順序遞增，每隔1-2個月發(fā)布一個穩(wěn)定版本1 EXTRAVersion稱為擴展版本號，它不分奇偶，順序遞增，每周發(fā)布幾次擴展本版號。1，1，2什么是標(biāo)準(zhǔn)內(nèi)核按照資料上的習(xí)慣說法，標(biāo)準(zhǔn)內(nèi)核（或稱基礎(chǔ)內(nèi)核）就是指主要在htp/www.kernelorg/維護和獲取的內(nèi)核，實際上它也有平臺屬性的。這些linux內(nèi)核并不總是適用于所有imux支持的體系結(jié)構(gòu)。實際上，這些內(nèi)核版本很多時候并不是為一些流行的嵌入式 linux系統(tǒng)開發(fā)的，也很少運行于這些嵌入式inux系統(tǒng)上，這個站點上的內(nèi)核首先確保的是在 InteIX86體系結(jié)構(gòu)上可以正常運行，它是基于X86處理器的內(nèi)核，如對inux-24l8ab2的配置 make menuconfig時就可以看到，Processor type and features->中只有386、486、586/K5/5x86/6x866x86MX、Pentium-Classic、Pentium-MMX、Pentium-Pro/Celeron/Pentium-ll，Pentium-Ill/Celeron（Coppermine），Pentium-4K6K6-/k6-Ⅲl、Athlon/Duron/K7、Elan，Crusoe，Winchip-C6·winchip-2
標(biāo)簽： linux
上傳時間： 2022-04-01
上傳用戶：
1. Preface2. The concept2.2. Prescience 2.3. Reading guide 2.4. Abbreviations 2.5. Version management3. Hardware3.2. ESP32 3.3.2. Hardware schema 3.3.3. DHT22 and level shifter 3.3.4. Geekcreit? ESP32 Development Board4. Software4.2. Installatie van GIT 4.3. Installatation of the ESP32 Core 4.4. Installation of the Xtensa and ESP32 Tools 4.5. Python 4.5.1. Install Python 4.5.2. Installation of pySerial and EspTool 4.6. Test the software installation5. The ESP32 IoT project 5.1.1. WiFi connection 5.1.2. Setup date and time 5.1.3. MQTT connection 5.1.4. Determining temperature and humidity 5.2. IOT_ESP32_Project source6. Test6.2. ESP32, NodeJS, MongoDB en Mosca 6.2.1. Start MongoDB 6.2.2. Start NodeJS Express serve and Mosca broker 6.2.3. Start the ESP32 6.2.4. Start an Chrome browser
上傳時間： 2022-04-05
上傳用戶：kingwide
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