PI_1

简单打字速度练习，采用倒计时10分钟进行速度练习。(Simply typing speed exercises for 10 minutes using the countdown speed exercises.)

助赢无线发射模块24l01调试程序for xs128(24l01 debugger to help win wireless transmitter module for xs128)

51单片机的串口通信程序，来自于开发板，VC环境下编写。(51 the Serial communication program, and from the development board, VC environment prepared.)

vb驱动控制器源代码就这样啦 具体自己看吧(vb drive controller source code)

pads 布等长线 (cloth pads and other long-term)

步进电机28BYJ48型四相八拍电机，电压为DC5V—DC12V。当对步进电机施加一系列连续不断的控制脉冲时，它可以连续不断地转动。每一个脉冲信号对应步进电机的某一相或两相绕组的通电状态改变一次，也就对应转子转过一定的角度（一个步距角）。当通电状态的改变完成一个循环时，转子转过一个齿距。四相步进电机可以在不同的通电方式下运行，常见的通电方式有单（单相绕组通电）四拍（A-B-C-D-A。。。），双（双相绕组通电）四拍（AB-BC-CD-DA-AB-。。。），八拍（A-AB-B-BC-C-CD-D-DA-A。。。）(Stepping Motor 28BYJ48 four-phase eight-phase motor, the voltage DC5V-DC12V. When a series of continuous control pulses are applied to the stepper motor, it can be continuously rotated. Each pulse signal corresponds to the stepper motor of a phase or two-phase winding power state change once, also corresponds to the rotor through a certain angle (a step angle). When the change in the power-on state completes one cycle, the rotor turns one pitch. Four-phase stepper motors can be operated in different power-up modes. The common power-up modes are: single-phase winding power (ABCDA ...), double (dual-phase winding)-DA-AB-...), eight beats (A-AB-B-BC-C-CD-)

这是一款模拟modbus从机的程序，可以方便用户调试modbus程序，本程序完全免费。(This is a simulation of the modbus from machines, can facilitate users to debug the modbus program, this program is completely free. )

USB2.0原理与工程开发光盘 欢迎下载(The USB2.0 principles and engineering development of CD-ROM Download)

AT89C51驱动直流电机，有仿真跟C语言。直流电机驱动，实现直流电机的正、反转，PWM调速。(AT89C51-driven DC motor, a simulation with the C language. DC motor drives, DC motor forward and reverse PWM speed control.)

通过上位机来控制LED显示的数字内容，主要是动态显示数字变化情况(Through the host computer to control the LED display digital content, mainly dynamic display of digital changes)