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超声波测距，可以通过串口助手显示，当小于设定值时，显示0，当大于设定值时，显示1(Ultrasonic Ranging, through serial aides showed that when less than the set value, 0, when greater than the set value, indicating a)

说明：  stm32f4系列开发手册中文，方便查找用途广泛(Stm32f4 series development manual in Chinese, easy to find and widely used)

Small Unmanned Aircraft：Theory and Practice 源码，小型无人机学习必备书籍项目源码，包含很多示例，全部由MATLAB/Simulink编写。(The source code of Small Unmanned Aircraft：Theory and Practice,which is the best text for the beginers.)

将hex文件发送给单片机，串口发送，快速方便，用于stm32(Hex file to the SCM serial, send, quickly and easily, for STM32)

介绍单相全桥逆变器的工作原理, 阐述产生SPWM波和实现PI 控制的算法, 给出以DSP( 数 字信号处理器) 实现控制的软件流程。实验表明利用软件完成逆变器控制是可行的。 关键词: 正弦逆变器 (Introduction of single-phase full-bridge inverter working principle, the resulting SPWM wave and realize PI control algorithm to DSP (digital signal processors) to achieve software flow control. Experiments show that the use of software controlled inverter is feasible. Key words: sine inverter)

门禁开发流程，通用流程解析，详细分析了小区门禁开发流程和思路等(Access control development process, general process analysis, train of thought analysis, etc.)

6通道音量控制器,PT2258,驱动程序(6 channel fader PT2258 driver)

数字电子时钟是一种使用数字电路技术实现时钟、分钟和秒钟定时的设备。 它在其他电子时钟中具有更高的准确性和主观性。数字钟包含扩展功能和基本功能。其中，基本功能部分：以数字形式准确定时，显示时、分、秒的功能; 扩展功能部分： 日期显示、闹钟、温度显示。(A digital electronic clock is a device that uses digital circuit technology to achieve clock, minute, and second timing. It has higher accuracy and subjectivity in other electronic clocks. The digital clock has two parts, basic functions and extended functions. Among them, the basic function part: accurate timing in digital form, display hours, minutes, seconds function; extended function part: date display, alarm clock, temperature display.)

简单的摇摇棒程序，基于c51环境下开发的。虽然简单，但很实用。刚入门的。(Simply shook his stick procedures, c51-based development environment. Although simple, but very practical. Just getting started.)

基于stm32的 hal库的 mpu6050六轴驱动程序。可读取角速度 加速度(Based stm32 of hal library mpu6050 six-axis driver. Read angular velocity acceleration)