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).
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!
標簽： MiniCore
上傳時間： 2021-02-22
上傳用戶：
專業計算衰減器衰減量，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
標簽： C++
上傳時間： 2022-02-19
上傳用戶：trh505
CPCI_E標準規范 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’
標簽： CPCIE
上傳時間： 2022-02-23
上傳用戶：
學習本章要達到的目標：口1.理解 Linux內核編譯選項的含義口2.學會根據不同的硬件配置裁減定制內核；口3.理解內核編譯過程中每一步的功能，并編譯 Linux2.630內核。需要去重新編譯 Linux內核口增加操作系統對新的硬件設備的支持口增加內核新的功能口對內核代碼或內核配置進行優化時Prompt for development and/or incomplete code/drivers口顯示處于開發調試中或尚未完善的代碼或驅口選中：如果是測試人員或者開發者；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"把內核模塊安裝在/lib/modules/中Kernel support for ELF binaries口內核對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系統的可執行文件格式，目前已經被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。口很多進程使用為這種機制在操作系統內部進行進程間通信，例如 X Window和 syslog等TCP/IP networking口TcP/IP網絡協議的支持
標簽： linux
上傳時間： 2022-03-29
上傳用戶：kingwide
第一章移植內核1.Linux內核基礎知識在動手進行 Linux內核移植之前，非常有必要對 Linux內核進行一定的了解下面從 Linux內核的版本和分類說起1.L.I Linux版本Linux內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內核的 Makefile中：其中的 Version和 PATCHLEVELI組成主版本號，比如24、2.526等，穩定版本的德主版本號用偶數表示（比如26的內核），開發中的版本號用奇數表示（比如25），它是下一個穩定版本內核的前身。SUBLEVEL稱為次版本號，它不分奇偶，順序遞增，每隔1-2個月發布一個穩定版本1 EXTRAVersion稱為擴展版本號，它不分奇偶，順序遞增，每周發布幾次擴展本版號。1，1，2什么是標準內核按照資料上的習慣說法，標準內核（或稱基礎內核）就是指主要在htp/www.kernelorg/維護和獲取的內核，實際上它也有平臺屬性的。這些linux內核并不總是適用于所有imux支持的體系結構。實際上，這些內核版本很多時候并不是為一些流行的嵌入式 linux系統開發的，也很少運行于這些嵌入式inux系統上，這個站點上的內核首先確保的是在 InteIX86體系結構上可以正常運行，它是基于X86處理器的內核，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
