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说明：  在freertos操作系统下采用modbus协议进行rs485通讯(485 communication using Modbus protocol under FreeRTOS operating system)

本文介绍了利用大规模专用集成电路SA4828设计变频器的方法。内容包括：SA4828的特性介绍及变频器的主电路、驱动电路、隔离电源、保护电路、速度检测、调速系统等部件的设计方法。(This article describes the use of large scale integrated circuit design of the inverter method SA4828. Include: SA4828 features introduced and the inverter main circuit, driver circuit, isolated power supply, protection circuits, speed detection, speed control system and other parts of the design.)

本例是基于STM32F407完成对。本代码主要完成MP3播放，界面显示等功能，还可在此基础上外扩点阵屏实现LED显示功能！(This case is based on the completion of the STM32F407. The code is mainly to complete MP3 playback, interface display and other functions, can also be based on the expansion of LED dot matrix screen display function!)

s51控制的ds18b20温度检测模块 源码用keil编译的(s51 ds18b20 temperature control detection module source code compiled with keil)

说明：  QT编写的上位机,用于BMS系统,功能十分齐全,极具参考(The upper computer compiled by QT is used in BMS system, which has complete functions and reference)

PIC18F4520控制Maxon电机恒速转动的PID数字调节程序(PIC18F4520 Maxon Motor)

驱动步进电机，旋转多次，寻找空间光强极大值初步程序(Drive stepper motor rotation several times to find space intensity maxima preliminary program)

说明：  1.从键盘上输入若干两位十进制数,寻找其中的最小值,然后在屏幕上显示出来. 2.两个十进制数之间的分隔符,输入结束标志自定,但要在报告中说明. 3.对输入要有检错措施,以防止非法字符输入,并有适当的提示. 4.将整个程序分解为若干模块,分别用子程序实现.在报告中要给出模块层次图.(1 Enter a number from the keyboard two decimal digits, to find the lowest value, and then displayed on the screen.           Separator 2. Between two decimal numbers, marks the end of a custom input, but to explain in the report.           3 have error detection on the input measures to prevent the illegal character input, and have the appropriate prompt.           4. The entire program is divided into several modules, each with subroutines in the report to give the module hierarchy diagram.)

一种通过USB将显示数据送入NAND FLASH中，并显示到OLED上的开发程序(through a USB data will be displayed into NAND Flash, and OLED displays to the development process)

Mapreduce实现的TF-IDF词频统计分析，可以直接运行于HADOOP环境下(Analysis of TF-IDF statistical Mapreduce to achieve, can be directly run in HADOOP environment )