51单片机控制的，电子时钟，万年历，可以显示年月日时分秒、星期、时间日期设置、闹钟设置、并且带有proteus仿真图和c程序。ds1302、lcd1602、蜂鸣器等零件。
51 single-chip control, electronic clock, calendar, you can display the month, day, every minute, day of the week, the date and time settings, alarm settings, and with proteus simulation map and c. part of the ds1302, lcd1602, buzzer, etc.. (2013-03-02, DOS, 2KB, 下载30次)
1．在内存中开辟一个虚拟磁盘空间作为文件存储器，在其上实现一个简单的单用户文件系统。在退出这个简单的文件系统时，应将该虚拟文件系统保存到磁盘上，以便下次可以再将它恢复到内存的虚拟磁盘空间中。 2．文件存储空间的分配可采用显式链接分配或其他的办法。 3．空闲空间的管理可选择位示图或其他的办法。如果采用位示图来管理文件存储空间，并采用显示链接分配方式，那么可以将位示图合并到FAT表中。 4．文件目录结构采用多级目录结构。为了简单起见，可以不使用索引结点，其中的每个目录项应包含文件名、物理地址、长度等
1.making a virtual diskete memory as file storyge,in this district it can implement a simple single user file system .when quit this simple file system ,it shoud save the virtual file system to diskete,then it can be resumed to virtual diskete district in the memory.3.we can choose location hint map to manage the idle space or orther means.if we choose locationhint map to manage file saving space,and adopt show linking distribution mode,we can combine location hint map into FAT table.4.file directory confiuration adopts multilevel directory confiuration.to simplify,it doesn t use index dot,evrery term shoud include file name,physical dress and lenght. (2010-12-26, DOS, 3062KB, 下载33次)
系统的数字PID仿真:针对离散系统的阶跃信号、正弦信号和方波信号的位置响应，设计离散PID控制器。其中，S为信号选择变量，S=1时为阶跃跟踪，S=2时为方波跟踪，S=3时为正弦跟踪。-
Digital PID simulation system: the step for the discrete system signals, sine and square wave signal the location of response, and design for discrete PID controller. Where, S is the signal selection variable, S = 1 when the step trace, S = 2 when a square wave trace, S = 3 when sinusoidal tracking.- (2010-07-06, DOS, 1KB, 下载9次)
10M光纤收发器的详细设计方案，该方案使用了ML4664芯片，内有详细的原理图和PCB布局图，该设计经过了严格测试，现已量产
10M Fiber Optic Transceivers detailed design program, which used the ML4664 chip, there is a detailed schematic and PCB layout, the design has been rigorously tested, is now in volume production (2009-04-13, DOS, 649KB, 下载227次)
8051 串行接口是一个可编程的全双工串行通讯接口。它可用作异步通讯方式（UART），与串行传送信息的外
部设备相连接，或用于通过标准异步通讯协议进行全双工的8051 多机系统也可以通过同步方式，使用TTL 或CMOS
移位寄存器来扩充I/O 口。
8051 serial interface is a programmable full-duplex serial communication interface. It can be used as asynchronous communication (UART), serial transmission of information with external devices connected, or used through a standard full-duplex asynchronous communication protocol for the more than 8051 systems can also be synchronized using a TTL or CMOS shift register to expand the I/O port. (2007-12-04, DOS, 184KB, 下载8次)
1 系统简介
与本文档配套的超声波测距模组为 V2.0 版本。
1.1 基本特性与参数指标
超声波传感器谐振频率：40KHz；
模组传感器工作电压：4.5V~9V
模组接口电压：4.5V~5.5V
1.2 主要功能
三种测距模式选择跳线 J1（短距、中距、可调距）：
短距：20cm~100cm左右（根据被测物表面材料决定），精度 1cm；
中距：70cm~400cm左右（根据被测物表面材料决定）；
可调：范围由可调节参数确定，当调节在合适的值时，最远测距 700cm左右；
a System and the documentation supporting the Ultrasonic Ranging Module version of V2.0. 1.1 the basic characteristics and parameters of the resonant frequency ultrasonic sensor : 40KHz; Voltage sensor module : 4.5V- 9V voltage interface module : 4.5V ~ 5.5V 1.2 three main functions ranging mode selection jumper J1 (short distance, the distance, adjustable from) : Short : 20cm- 100cm% (based on the object surface materials), the accuracy 1cm; China interval : ~ 70cm depth of 4 m% (based on the object surface materials); Adjustable : ranging from adjustable parameters. When appropriate adjustments in the value, the farthest ranging 700cm%; (2006-09-25, DOS, 930KB, 下载86次)