PID

It can be used to simulate body force in Discrete Particle Model (DPM) in ANSYS FLUENT v14.5

说明：  基于Stm32F103C8T6的PWM呼吸灯，由PWM占空比调节LED灯的亮度(PWM breathing lamp based on stm32f103c8t6)

说明：  板载三个灯同时亮灭，板子上可以看到灯发出闪烁的白光(On-board three lights turn on and off at the same time)

说明：  使用于ＡＶＲ单片机的几种Ｃ语言，大家可以参考一下，以便以后在ＡＶＲ的程序编写中提高自己(used in the AVR several C language, we can make reference to the AVR after the procedure to improve their writing)

说明：  STM32+AD7606串行程序，采用spi串行读取数据，单片机采用stm32f407(STM32+AD7606 serial program,using spi serial to read data,single-chip using stm32f407)

ds1302液晶时钟液晶时钟及温度检测程序(the ds1302 LCD Clock LCD Clock and temperature testing procedures)

四悬翼 源码，mpu6050 超声波测距(Four hanging wing source, mpu6050 Ultrasonic Ranging)

利用STM32的内部温度传感器来显示温度值，并在TFTLCD模块上显示出来。(Use STM32 internal temperature sensor to display the temperature value and displayed on TFTLCD module.)

说明：  首先它能显示环境的温度并能设置上下限阀值，这是最基本的功能，系统上电的时候显示的是当前环境温度和设定的温度阀值，我们可以通过按键来修改温度上下限阀值。(First of all, it can display the environment temperature and set the upper and lower limit threshold, which is the most basic function. When the system is powered on, it displays the current environment temperature and the set temperature threshold. We can modify the upper and lower limit threshold by pressing the key.)

PrivilegedActionException wraps exceptions which are thrown from within privileged operations.