changkouLED

C程序，红外遥控启停源码，可用于智能车，普通单片机遥控器即可(C programs, infrared remote start-stop source for intelligent vehicles, ordinary single-chip remote control to)

说明：  51单片机的拼音输入法的程序，用C实现，(51 SCM Pinyin input method to the procedures used to achieve C,)

QuizMaster for viusal basic.

基于430的DC_DC变化，采用PID控制，调节PWM的输出占公比，从而反馈调节输出电压(Based on 430 DC_DC change, using PID control, adjust the PWM output accounted common ratio, thus regulating the output voltage feedback)

深入浅出STm32 深入浅出STM32系列ARM_Cortex-M3.pdf(Stm32 study)

根据对应的按键值，对应输出相应的电容值，并做掉电检测(According to the corresponding key value, corresponding to the output of the corresponding capacitance values ​ ​ and do brownout detection)

使用VB与PIC采集,采用软件中断方式，使用研华1710集成卡。(Using VB with PIC acquisition, the software interrupt, use the the Advantech 1710 integrated card.)

ad7991测试程序，需要自己填写控制字(ad7991 testing procedures need to fill their own control word)

双馈风电机组的PSCAD模型，是通用模型，有助于帮助解决双馈风电机组建模问题(PSCAD doubly-fed motor model)

说明：  下面的程序利用友元函数求两点间的距离。请你将有关的程序补充完整，并总结为什么这里要用友元函数来求两点间的距离。(using friend to get the result.)