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利用PID增量式算法调节PWM信号的输出波形，使其更加稳定(Using PID incremental algorithm to adjust the output of the PWM signal waveform, make it more stable)

在原有基础上添加了新的功能，如EEPROM存储数据，选择更人性化(Based on the original by adding new features such as EEPROM to store data, choose a more humane)

stm32 控制ad9851 的程序 串行模式(stm32 serial mode control program ad9851)

说明：  利用MSP430单片机实现5分钟倒计时。用Timer_A实现1s定时，4位共阳型数码管显示时间，显示格式为：“x-xx”，分别代表“分”、“十秒”和“秒”。每隔1s，倒计时器的时间减1，倒计时从4分59秒开始计时，至0分0秒结束，停止计时。(MSP430 microcontroller is used to realize 5 minute countdown. Timer_A is used to realize 1s timing and 4-bit common-sun digital tube display time. The display format is "x-x x", representing "minutes", "ten seconds" and "seconds" respectively. Every 1s, the countdown time is reduced by 1. The countdown time starts at 4:59 seconds and ends at 0:0 seconds.)

该仿真原理图可以通过单片机控制，实现频率和波形的改变(The simulation schematic MCU control, frequency and waveform changes)

基于51单片机的232串口通信源码，有大量实例，其中包括数据发送、接收、双向通信、1206通信显示等，有汇编代码也有C语言代码，在实际项目中可以直接复制。(Based on 51 SCM 232 serial interface communication source, there are plenty of examples, including data sending and receiving, two-way communication, 1206 communications display, assembly code also have C language code, in practical projects can copy.)

智能人体感应自动门程序，基于51单片机，主要应用于人员流动频繁的场所。(Intelligent human sensing automatic door program, based on 51 single, frequent staff turnover is mainly used in places.)

STM32 的GPIO操作示例程序代码, 试用与Keile环境STM32F103代码(STM32 GPIO operation code)

风力摆是一种通过风机作为唯一动力驱动的装置,深入研究该系统对空间飞行器、四旋翼无人机的运动状态和卫星姿态控制具有重大意义。(Wind pendulum is a device driven by wind turbine as the only power. It is of great significance to study the motion state of space vehicle, quad-rotor UAV and satellite attitude control.)

说明：  nokia5110显示屏在stm32最小系统板上的测试例程(Test routine of Nokia 5110 display on STM32 minimal system board)