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程序是用stm32输出来的信号来控制继电器的开通与否，继而来控制电机的状态(Program is with stm32 output signal to control the opening of relay or not, and then to control the state of the motor )

摘 要 电机转速是电机的一个极为重要的状态参数 文中介绍了几种基本的电机转速测量 方法 并对这些测量方法进行了比较 给出了基于加速度计进行电机转速测量的硬件电路设 计方法和测试系统的工作原理(Summary of the motor speed is an extremely important motor state parameters paper describes several basic motor speed measurement methods and these measurements were compared based on accelerometer gives the motor speed measurement hardware circuit design and test systems Works)

STC单片机检测IO电平变化，并计数，接收到串口指令时，发送计数或者控制继电器输出(STC microcontroller detects the change of IO level, counts and receives the serial port instruction, sends the count or controls the relay output.)

基于51单片机叮咚门铃的一个简单的程序，方便于新手的学习(A simple procedure based on 51 single-chip ding-dong doorbell, easy for beginners to learn)

1602LCD工作于四位模式实时显示当前时间，本程序液晶数据端口仅使用了四只引脚,实现日期时间的实时显示.(1602LCD works in four modes display the current time, the program uses only the LCD data port four pins, date and time of the real-time display.)

显示屏的设计，是用51单片机做的，对初学的好有用(display is designed to use 51 microcontroller done, a good pair of useful learning)

PWM输入+DMA，亲测可用，有需要的朋友可以自行下载。(PWM input + DMA, pro-test available.)

说明：  配置系统的时钟，用于单片机的学习，基于开发板LPC1114,程序虽然比较小，却是一个完整的模块，可以作为一个模板，在此基础上添加其他外设及相关编程。(Configuring the clock of the system is used for the learning of MCU. Based on the development board LPC1114, the program is relatively small, but it is a complete module, which can be used as a template, on which other peripherals and related programming are added.)

PSCAD电力系统分析，双电流互感器，6种故障模型，值得您的期待(Pscad analysis in power system, the double current transformer, 6 kinds of fault model)

51单片机使用短信Modem发送短消息的例子。(51 MCU send text messages using SMS Modem example.)