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说明：  自我学习STM32教程，学习进步，兴趣是最好的老师，只要愿意学就能成功(Self-learning STM32, learning progress, interest is the best teacher, as long as willing to learn can succeed.)

可以实验pwm输出实验，采用的是原子电路 ，使用STM32f103芯片(PWM output experimental atomic circuit)

基于at89s52的四位数码管动态显示，扫描时间用中断实现(led of at89s52)

基于STM32F103的智能充电器，PID调节恒压恒流输出，具有温度补偿，过欠压，过欠流保护功能，可直接用于开发。注释比较详细。(STM32F103-based smart charger, PID regulation constant voltage constant current output, with temperature compensation, over-voltage, over-current protection owed can be directly used for development. More detailed notes.)

HTM5 SVG电子打击乐器音效代码，鼠标点击操作，输出电子鼓音效，也可进行键盘操作。(HTM5 SVG electronic percussion sound code, mouse clicks, the output of electronic drum sound, but also for keyboard operation.)

说明：  stm32板上的SD卡的使用，通过SPI接口控制SD卡，不涉及文件系统，只是简单的实现底层读写接口，编译环境为IAR。(stm32 board SD card, SD card through the SPI interface to control the file system does not involve simply the realization of the underlying reader interface, IAR compiler environment.)

简单计算器的实现，网上看的，少有改动，能用(The realization of a simple calculator, online watch, few changes can)

Multisim10的DAC原理仿真演示。采用两个计数器级联成8位计数器，然后进行DAC转换。转换前后的结果分别用数码管和示波器显示。对理解DAC的原理非常有帮助。(This simulation contains two digital counters to generate 8-bit output to DAC, both digital number and analog values are dispayed. It is helpful to understand the principal of DAC.)

1.5MW双馈风力发电机低压穿越模型，该模型使用于风力发电方面。(1.5MW double-fed motor low pressure across the model)

关于MMA7361的测试程序，包括主程序和功能程序(. MMA7361 test program, including the main program and function procedures)