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51单片机AT89C52串行通信.上位机通过串口向单片机发数据，单片机接收后发回给上位机。(51 AT89C52 single-chip serial communication. PC send data through the serial port to the microcontroller, the microcontroller has sent back to the host computer.)

通过C语言编程，使12864液晶显示屏能够正确显示相关图片( Through C language programming, makes 12864 LCD display correctly picture)

Himax LCD Initialization code

数码管显示原理子程序（松翰）， (jlkfjslkajflkjasljfljalksjfdlk)

使用STM32的RTC时钟做的一个石英时钟，能掉电保存，时间准确，界面美观(The use of STM32 RTC clock to do a quartz clock, can save power, accurate time, beautiful interface)

说明：  按键控制STM32单片机输出PWN波占空比和频率可调(Key control STM32 MCU output PWN wave duty cycle and frequency adjustable)

说明：  介绍了用8031 单片机控制的电脑数字钟的硬件结构与软件设计。给出了汇(Introduced the 8031 microcontroller using a computer controlled digital clock in the hardware structure and software design. Gives the Department of)

点阵移动显示信息，里面有原理图，有详细的代码解析，不过是英文来解析的。(moving message display)

基于51单片机开发板，矩阵键盘按键在数码管上显示0~F(Based on 51 MCU development board, matrix keyboard keys on the digital display 0 ~ F)

相比于传统使用的电机，永磁同步电动机（PMSM）具有着比较高的工作效率、比较高的力矩惯量比、比较高的能量密度和环保节能等优越特性，所以对永磁同步电机进行控制调速方面的研究有着相当重要的意义。我们设定电机转速初始值作为给定值，然后与反馈的实际值进行比较，得到的差值输入PI控制器进行控制，得到交轴电流。同时三相绕组输出的电流经过clarke变换和park变化得到电流的实际值，分别与给定值进行比较，将比较后的值再进行park转换，得到的结果经过SVPWM技术调制之后输入到逆变器，继而可以驱动三相电机。(Used compared to traditional motor, permanent magnet synchronous motor (all-digital fuzzy) has a higher efficiency, higher moment of inertia ratio, higher energy density and superior properties such as environmental protection and energy saving, so the control of permanent magnet synchronous motor speed regulation research has important significance. We set the initial value of motor speed as the given value, and then compare it with the actual value of feedback. The difference obtained is input to PI controller for control, and the current of crossaxis is obtained. At the same time the output three-phase winding current through Clarke transformation and park changes the current actual value, compared with a given value respectively, after comparing the value of the park transformation again, the result after SVPWM modulation technology input to the inverter, which in turn can drive three-phase motor.)