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超声波模块制作了一个测距装置，HC-SR04自身不带温度补偿功能，所以加上一个使用DS18B20做的温度测量模块。整个系统包括：51单片机最小系统，超声波测距模块、温度测量模块、液晶显示模块。(The ultrasonic module has made a distance measuring device, HC-SR04 does not have temperature compensation function, so add a temperature measuring module using DS18B20. The whole system includes 51 single chip microcomputer minimum system, ultrasonic ranging module, temperature measurement module and LCD module.)

说明：  wireless charging source code.

spice user Mannual is one kind mannal to inroduce how to build up the simulation files step by step

A4988步进电机的驱动程序，使用STM32F407单片机驱动(A4988 stepper motor driver)

原理采用Altium Designer软件设计，内含MPPT的BUCK拓扑结构、DCDC复制电源转换、微控制器等电路(The principle is designed by Altium Designer software, including MPPT BUCK topology, DCDC copy power conversion, micro controller and so on)

LCL逆变器电容电流反馈和逆变器侧电流反馈有源阻尼(LCL inverter capacitor current feedback and inverter side current feedback active damping)

AD9914是一款直接数字频率合成器(DDS)，内置一个12位数模转换器，目标工作速率最高达3.5 GSPS，产生单音信号，双音信号以及调幅调相信号(AD9914 is a direct digital frequency synthesizer (DDS) with a 12 digit analog converter with a target operating rate of up to 3.5 GSPS, producing a single tone signal, a dual tone signal and a phase modulation signal.)

采用STM32F105和FPGA设计的驱动液晶屏的电路图。(Circuit diagram of driving LCD screen designed by STM32F105 and FPGA)

说明：  电解电容工程笔记(Aluminum capacitor note)

说明：  文件中包含stm32开发板所配套的开关使用说明的程序例程，重在讲解开关是如何被使用的，在kEIL5软件上怎么编写的。(The document contains the program routine of the switch instructions matched by STM32 development board, focusing on how the switch is used and how to write on kEIL5 software.)