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说明：  为快速傅里叶变换用c语言在51单片机中实现(Realization of Fast Fourier Transform with C Language in 51 Single Chip Microcomputer)

说明：  CW2015库仑计在STM32下完整代码，通过I2C通信，可以直接编译使用。(coulometer CW2015 code under STM32 MCU)

四字16*16点阵电子屏字符显示器 显示字用查表法，不占内存，用四个16*16共阳LED点阵显示， 效果：向上滚动显示字，每次四个，重复循环(Four characters 16* 16 dot matrix electronics display screen characters use the word look-up table method, do not account for memory, with a total of four 16* 16 LED dot matrix display Yang, effect: scroll up words, every four, repeat cycle)

斯凯科技zigbee无线定位实验说明书，可依据以上说明书进行协议栈定位实验(Skye zigbee wireless location technology experiment instructions, experiments can be carried out according to the protocol stack positioned above instructions)

降压斩波电路仿真，可以加深对dcdc变换的理解(Buck chopper circuit simulation, you can deepen the understanding of the DCDC transform)

自己动手用C语言编写的火车票订票系统，很适合C语言初学者学习和交流(Yourself C language ticket booking system, it is suitable for beginners to learn C language and communication)

水箱水位自动控制系统,通过超声波对水位高度的检测，把数据传入到单片机中处理，得出当前水位，并根据当前水位的高低程度调控直流电机和步进电机转动实现水位的增加或减少，从而实现水位的自动控制。(the system of water auto control )

12864的液晶程序。51单片机开发的C代码，便于移植(12864 LCD program. 51 MCU development of C code, portable)

存储器（RAM 6264）扩展 可编程并行接口（8255）扩展 可编程计数/定时器（8253）扩展 A/D、D/A转换 可编程串行通信接口（8251）扩展 　　(Memory (RAM 6264) extended programmable parallel interface (8255) extended the programmable counter/timer (8253) Expansion A/D, D/A conversion programmable serial communication interface (8251) extended)

　　　锅炉是工业过程中不可缺少的动力设备，为确保安全，稳定生产，对锅炉的自动控制十分重要。汽包水位是锅炉运行的主要指标，汽包水位过高过低都会影响运行的安全与经济性，必须严格加以控制。本文主要是用MATLAB对锅炉汽包水位控制系统进行仿真研究。建立了锅炉汽包水位对象的数学模型和控制系统，并用Matlab语言在计算机上编制锅炉汽包水位控制系统的仿真程序。通过对象特性、最佳PID参数整定、控制系统比较分析，了解了汽包水位对象特性、整定出了最佳PID参数、总结出了各种控制方案的特点与适用场合。 (　　　Boiler is a necessary power plant in the process of industry. In order to ensure the production and security, the auto-control of it is very important. The drum water level is an important variable to be controlled, it is hard to get the mathematic model of the water level with adjustive process, it is characteristic of nonlinearity, instability and time lag. The traditional control mode of three-variable in the drum water level mostly use PID.The problem of automatic control in industry coal-fired boiler is discussed in this thesis. First of all，the technological process and characteristics of industry boiler is analyzed. The task of boiler regulator is expounded. And then the system scheme of control is presented. The dynamic characteristic of loops for water level is analyzed especially the reason of ostensible water level. On the basis of these a routine PID controller is designed to control the water level. The part of differential is sensitive to high frequency noise, and easi)