ServiceBrokerExtSource

开关电源测试 标准 (Switching power supply testing standards)

w90p710的LCD显示图片的程序，已测试(w90p710 the LCD display pictures of the process, have been tested)

状态机按键检测，实现单击双击多击功能,单片机用的是STM8L(Key detection state machine to achieve multi-click-click, double-click function)

桌面监视器,带键盘监视功能 可用于关闭一些广告窗口或不希望出现的任意窗口,键盘监视功能带回放器,可播放鼠标键盘的操作过程(desktop monitor, with the keyboard function can be used to monitor the closure of some advertising window or do not want to see is the arbitrary window, Keyboard surveillance function with playback device that can broadcast mouse keyboard operation process)

该工具可以根据输入的UNICODE十六进制字符串计算出相应的汉字或ASCII码。比如：输入4F60便可以得到"你"。(The tool can be based on the input UNICODE calculate the corresponding hexadecimal string guy or ASCII.)

滤波器广泛应用于数字信号处理、通信、自动控制领域,但设计可变宽频带有源滤波器则比较困难。利用单片机控制参数可编程的双二阶通用开关电容有源滤波器,精确设置有源滤波器的中心频率f，品质因数Q及有源滤波器的工作方式。本系统主要分为两个部分:即程控滤波器和程控放大器。程控放大器电压增益为40dB，通过单片机控制DA进行分压，可精确实现要求的10dB步进，误差小于0.5 ，通带为100Hz-500KHz，输入电压峰－峰值范围为10mV，在输入范围内无明显失真。由MAX264为核心的滤波器，可设置为高通、低通滤波器。通过单片机直接给出控制频率，使-3dB截止频率在1KHz-20KHz内可调，步进1KHz，误差小于1 。整个系统以52单片机为控制核心，电路简单，性能稳定，且具有较高精度，滤波参数调节通过单片机控制，较为方便。(Filters are widely used in digital signal processing, communications, automatic control area, but the design variable wideband active filter is more difficult. Control parameters using single-chip programmable universal switched-capacitor biquad active filter, active filter accurately set the center frequency f, quality factor Q and the active filter works. The system is mainly divided into two parts: the program-controlled filters and programmable amplifiers. Programmable amplifier voltage gain of 40dB, the DA through the partial pressure of single-chip control, can accurately achieve the required 10dB step, the error is less than 0.5 , passband to 100Hz-500KHz, input voltage peak- the range of 10mV, the input range no significant distortion. By the MAX264 as the core of filter can be set to high pass, low pass filter. Given directly by the microcontroller controls the frequency, the-3dB cutoff frequency at 1KHz-20KHz adjustable, step 1KHz, error is less than 1 . The entire system for)

电机运行的流程图，用visio画的图，可以直接复制到word中使用(the picture in the visio)

XListCtrl控件源码，一个很有用的列表扩展控件(CListCtrl control source, a useful list expansion control)

单片机通信，vb与18b20温度传感器通信资料，包括上位机和下位机程序(Single-chip communication, vb and 18b20 temperature sensor communication data, including upper and lower machine program)

基于keil软件的51单片机程序，18B20测温及12864液晶显示的文件。晶振为12M(Based on the the keil software 51 microcontroller procedure 18B20 temperature measurement and 12864 LCD file. Crystal-12M)