Cheap_flash_fs(高端版)--嵌入式FAT16/32文件系统源码免费下载
本代码兼容FAT16/FAT32文件系统两种格式，兼容微软长文件名，
支持中文文件名(带有GB2312/UNICODE转换码表，170KB)
支持多级子目录，支持文件读取，写入，删除，创建等等文件系统的常用功能。
总之，本文件系统源代码全部使用C代码编写，VC仿真测试，通过各种单片机的编译器，移植去各种单片机平台上实现文件系统模块。
本代码的一次写可以达到1000个扇区以及更多，欢迎选用。
(本代码是由我们提供的源代码，用户可根据需要测试，研究，和应用本代码。可用于商业产品上。
Cheap_ flash_ FS (high end version) -- free download of embedded FAT16 / 32 file system source code
This code is compatible with FAT16 / FAT32 file system and Microsoft long file name,
Support Chinese file name (with GB2312 / Unicode conversion code table, 170kb)
Support multi-level subdirectories, support file read, write, delete, create and other common file system functions.
In a word, the source code of this file system is written in C code, vc simulation test, through the compiler of various single chip microcomputer, transplanted to various single chip microcomputer platform to realize the file system module.
(this code is the source code provided by us, users can test, research and apply this code according to their needs. It can be used in commercial products.
If you need to contact the author, you can contact the author through the following contact information. (2020-10-29, DOS, 2840KB, 下载1次)
CC2520-CC2591EM 参考设计包含 CC2520-CC2591EMK 评估模块套件中使用的 CC2520-CC2591EM 评估模块的原理图和布局文件。
该参考设计演示了如何集成 CC2520 和CC2591，并展示了用于去耦和射频布局的精湛技术。为了实现最佳射频性能，这些部件应当被精确复制。这是一个具有 SMA 天线连接器（便于射频输出与 50Ω 相匹配）和倒 F PCB 天线的 4 层参考设计。
The CC2520-CC2591EM Reference Design contains schematics and layout files for the CC2520-CC2591EM uation module used in the CC2520-CC2591EMK Evaluation Module Kit.
The reference design demonstrates how to integrate CC2520 and CC2591, and shows good techniques for decoupling and RF layout. For optimum RF performance, these parts should be copied accurately. This is a 4-layer reference design with both an SMA antenna connector for RF output matched to 50 ohm and an inverted-F PCB antenna.
(2015-01-04, DOS, 775KB, 下载19次)
使用AD转换芯片TLC549CP对模拟电压进行数字转换，将转换的结果处理为3位的十进制数（000~255）并通过ZLG7290B进行显示。
在AD转换的十进制显示实验的基础上：增加“声”、“光（7290的闪烁）”报警。蜂鸣器发声， ZLG7290的闪烁功能实现光报警。 “上”、“下”限采用不同频率的声音报警。
可键盘输入、设定报警值。
Use AD converter chip TLC549CP analog voltage digital conversion process converts the result to three decimal number (000 to 255) and by ZLG7290B display. In AD conversion decimal display on an experimental basis: add " sound" , " Light (7290 flashing)" alarm. Buzzer, flashing light alarm function ZLG7290 realization. " Up" and " down" limit the use of different frequencies of sound the alarm. To keyboard input, set the alarm value. (2014-12-21, DOS, 2KB, 下载1次)
1.编写一个 32 位二进制数除以 16 位二进制数的除法程序.观察当除数为 0,或
超过相应寄存器范围时,程序执行的结果.
2.修改零号中断服务程序,使它具有以下功能:
(1)判断除数是否为 0,当除数为 0 时,显示相应的结果
(2)当除数不为 0 时,采用适当的方法完成商超过 16 位的二进制数的除法运算.
3.注意必须保护原有中断服务程序的入口地址,并在程序完毕前加以恢复.
1 to write a 32-bit binary number is divided by the number of 16-bit binary division process observed when the divisor is 0, or
Exceeds the corresponding register range, the result of program execution.
(2) modify the number zero interrupt service routine, it has the following features:
(1) determine whether the divisor is 0, when the divisor is 0, display the corresponding results
(2) When the divisor is not zero, using the appropriate method to complete more than 16 providers of division of binary numbers.
3 Note that you must protect the existing entry address of the interrupt service routine, and restore them before the program is completed. (2014-06-16, DOS, 2KB, 下载1次)
以监控和控制为目的的算法因为其数据要在数据中心汇总和处理，大多使用集中式算法，其精度较高，但通信量大。分布式算法是传感器节点在采集周围节点的信息后，在其自身的后台执行定位算法，该方法可以降低网络通信量，但目前节点的能量，计算能力及存储能力有限，复杂的算法难以在实际平台中实现
To monitor and control algorithms for the purpose because of its data to be aggregated and processed in the data center, mostly using centralized algorithm, its high accuracy, but the communication volume. Distributed algorithm is the information collected in the sensor nodes around node positioning algorithm executed in its own background, the method can reduce network traffic, the limited energy of the current node, computing power and storage capacity, the actual complex algorithms difficult platform to achieve (2014-04-21, DOS, 3942KB, 下载3次)
论文概述了超声波检测的发展及基本原理，阐述了超声波传感器的原理及特性。对于系统的一些主要参数进行了讨论，并且在介绍超声波测距系统功能的基础上，提出了系统的总体构成。通过多种发射接收电路设计方案比较，得出了最佳设计方案，并对系统各个设计单元的原理进行了介绍。对组成各系统电路的芯片进行了介绍，并阐述了它们的工作原理。论文介绍了系统的软件结构，通过编程来实现系统功能。
This article describes a microcontroller-based data acquisition hardware and software design, data acquisition system is the essential link between the analog and digital domains, and its presence has a very important role. The focus of this paper is the data acquisition system, and part of the center of gravity of the system hardware is that the microcontroller. The hardware part is a microcontroller as the core, but also including the A/D conversion module, LCD1602 display module part. The measured voltage of the 8-way through the ADC ADC0809, the analog-to-digital conversion, analog to digital conversion on the data collected, and the converted data through the LCD1602 display to display the results collected, and can be button to view the voltage value of an arbitrary path, the entire system with easy operation, simple circuit, the measurement error is small, etc.. Keywords: microcontroller AT89S52, analog-to-digital converter ADC0809 data acquisition, LCD1602 display (2013-04-08, DOS, 1008KB, 下载6次)
LF398采样保持器，由双极性绝缘栅场效应管组成，它具有采样速度快、保持下降速度慢、精度高等特点，采样时间小于6μs时精度可达O.01％；采用双极性输入状态可获得低偏置电压和宽频带；抗干扰能力强，不易受温度影响；芯片上的逻辑输入端均为具有低输入电流的差动输入，允许直接与TTL、PMOS和CMOS相连，差动门限为1.4 V，电源电压可在士5 V和±18 V之间变化．
LF398 sample and hold device, the insulated gate bipolar field effect transistor formed, it has a sampling speed, to keep down slow, high precision, when the sampling time is less than 6μs accuracy up to O.01 with bipolar input state can achieve low offset voltage and wide bandwidth anti-interference ability, easily affected by temperature chip logic inputs are differential with low input current input, allowing direct and TTL, PMOS and CMOS linked differential threshold is 1.4 V, power supply voltage of ± 5 V and ± 18 V between the changes. (2010-08-01, DOS, 56KB, 下载216次)
交流220V市电电网应是电压源，它的内阻示波器的输入电阻应愈大愈好，以减轻它对被测电路的影响。
负反馈虽使放大器的增益下降，但可加大放大器的频带宽度，即使fH、fL均增大。
低通滤波电路对信号的相移为正值，即输出信号的相位要落后于输入信
AC 220V electricity grid should be voltage source, its internal resistance of the oscilloscope input resistance should be the bigger the better, in order to reduce its influence on the circuit under test. Although negative feedback gain of the amplifier down, but can increase the bandwidth of the amplifier, even if fH, fL will increase. Low-pass filter circuit on the signal phase shift is positive, that is, the output signal of the phase to be lagging behind the input signal (2010-04-09, DOS, 122KB, 下载4次)
1 操作说明：
根据提示输入三位编码（编码不大于255），可以按N键删除编码，按Y键确认，再按UP键为上行，按DOWN键为下行，按S键，为停止。再次按N键为删除编码，可重新输入其它编码进行其它灯的控制。
注：仿真中显示画面是倒着的。
2 用途：
此遥控器用来作智能升降机遥控升降用，当然也可以改成其它用途，整机用锂电池供电，采用专用的无线收发模块，显示用12864点阵液晶显示。有效控制距离，50m左右，欢迎大家欣赏！
3 打开仿真文件，直接运行即可看到显示画面。本仿真软件用的是protues7.5版本的。
1 Instructions:
According prompted three encoding (encoding is not greater than 255), you can press N key to delete the code, press Y button to confirm, then press UP key for uplink, press DOWN key is down, press S key to stop. Press N key again to remove code, may re-enter the other codes for other lighting control.
Note: The simulation of the display is backwards.
Two purposes:
The remote control is used to make intelligent lifts with the remote control lifting, of course, can also be changed to other uses, lithium battery-powered machine, using a dedicated wireless transceiver modules, dot-matrix LCD display with 12864. Effective control of the distance, 50m or so, welcome everyone to enjoy!
3 Open the simulation file, you can see the direct operation display. The simulation software is used in protues7.5 version. (2010-03-26, DOS, 209KB, 下载7次)
1、正常情况下在LED数码管上显示时钟和温度。显示格式为：hh.mm tto，其中hh为2位小时数，mm为2位分钟数，中间的.每隔1秒交替亮暗，tt为2位温度，温度范围为-50oC-+50oC，“o”为温度单位摄氏度。
2、假设选用的温度传感器已将温度-50oC-+50oC变换为0-5V电压信号，请完成温度值的采集并进行标量转换，再显示在LED数码管上。
3、应采取数字滤波技术提高温度测量稳定性（如均值滤波）。
4、若闹钟设置的时间到，则闹铃（可以驱动指示灯亮代替）。
5、通过开关，可切换显示日期，格式为YYYYMMDD，YYYY为4位年份，MM为2位月份，DD为2位日期。
6、通过开关完成时钟值、闹钟时间及日期的设定。
7、开关需要有防抖动处理。
1、 normal circumstance, LED digital display in the tube temperature and clock. Hh: display format for j, including hh tto mm for two hours to 2 minutes, mm, middle. Every 1 SEC alternate light and dark, tt for two temperature, temperature range for- 50oC-+ 50oC, "o" for temperature unit degrees Celsius.
2、 the assumption of the temperature sensor has 50oC temperature- 50oC transform for 0-+ 5V voltage signal-, please complete collection of temperature and conversion, show in scalar LED digital tubes.
3、 should adopt digital filtering technology improve temperature measuring stability (such as mean filter). (2009-05-30, DOS, 234KB, 下载4次)
单片计算机即单片微型计算机。（Single-Chip Microcomputer ）,是 集CPU ,RAM ,ROM ,
定时，计数和多种接口于一体的微控制器。他体积小，成本低，功能强，广泛应用于智能产
品和工业自动化上。而51 单片机是各单片机中最为典型和最有代表性的一种。这次毕业设
计通过对它的学习，应用，从而达到学习、设计、开发软、硬的能力。
Monolithic single-chip microcomputer computer. (Single-Chip Microcomputer), is a CPU, RAM, ROM, timing, counting and multiple interfaces in one microcontroller. His small size, low cost, powerful, widely used in intelligent products and industrial automation. And 51 single-chip single-chip is the most typical and most representative one. The graduation project through its study and application to achieve the study, design, development software and hardware capabilities. (2009-04-14, DOS, 117KB, 下载4次)