Ultrasonic

STM32F103实现控制DDS模块的功能，采用SPI通信的方式(STM32F103 realizes the function of controlling the DDS module and uses the SPI communication mode)

Modified rom based logic

关于LPC932的RC522的S50非接触式IC卡程序源码程序，周立功模块配套程序更改，可正常使用(s50Mifare 1)

随着可持续发展理念的深入，风力发电作为可再生能源得到了快速的发 展。风力发电系统的仿真在风力发电系统分析，发电量分析和电网的能量的 分析中都起到了非常重要的作用。 本文应用 MATLAB 软件，对风速、风轮、传动机构、发电机、与风力发 电相关的电力电子系统建立了数学模型，并进行仿真进方面的研究，得到了 可供分析的仿真结果。介绍了风力发电机组的控制技术，主要是变桨距控制 和发电机变速控制，并利用 MATLAB 软件对变桨距控制系统和低于额定风速 和高于额定风速时的变速风力发电系统进行了仿真。对双馈发电机的解耦控 制进行了仿真。并列举了典型的风力发电系统仿真实例。 (With the wild spread of concept of continuable development ， wind power generation, as a renewable resource, is getting fast development. The simulation of wind power system play a important role in yield of analysis of wind power generation system, the quantity of wind power generation , power generation system. This paper establish wind model, the wind turbine rotor model, drive trains model, induction machine model ， the electric power electron parts of wind power generation model, Then using soft of MATLAB, we realize the simulation. It introduces the control technology of wind turbine, mainly including variable blade pitch and variable speed control of wind turbine. Using Matlab simulate these. And lists an example of practical applying.)

BS83B12A-3触摸按键实现的空气净化器C源码.触摸部分的配置使用官方提供的汇编源码.(BS83B12A-3 touch buttons to achieve air purifier C source code. Configure the touch part using the official compilation of source code.)

applications of numerical analysis

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.)

基于pscad的SS4g电力机车模型，真诚奉献。(Based on the SS4g pscad model electric locomotive)

着重介绍了PIC单片机的开发环境MPLAB，使用方便快捷易懂，给初识之士借鉴之！(this paper descripte the use of MPLAB on PIC )

根据stm32f103自带DA功能和DMA实现输出正弦波,可根据改变定时器周期改变正弦波频率。(According to the DA function and DMA of stm32f103, the output sinusoidal wave can be realized, and the frequency of sinusoidal wave can be changed according to the period of timer.)