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FDTD 2d with PML

用winform窗口制作的一个贪吃蛇小游戏，游戏功能比较完善； 自己设计加入了传送门和炸弹，增添了趣味性。

说明：  用于基本的envi熟悉认知，步骤清晰，亲历亲为，切实可用(It is used for basic envi, familiar with cognition, clear steps, personal experience and practical use)

采用霍尔传感器3020T,根据霍尔效应原理,在电机转轴边沿上放一永久磁钢,转轴附近放一个别3020T,当转轴旋转时,受磁钢的影响,霍地尔器件输出脉冲信号,送至单片机中断引脚,转速计数加1,单片机内部产生5s的定时,计算出1分钟的转速,送至显示单元,(Using Hall sensors 3020T, according to Hall-effect principle, the motor shaft of a permanent magnet placed on the edge, do not put a shaft near the 3020T, when the shaft rotates by magnet effect, HUO Di Seoul device output pulse signal, sent to microcontroller interrupt pin, speed count plus 1, the microcontroller internally generated timing 5s to calculate the speed of 1 minute, sent to the display unit,)

SPEI计算SPEI的R语言版与可执行版（含下载网址）.rar(SPEI calculated SPEI R-language version of the executable version (with download link). Rar)

用循环程序 画用星号* 组成的方框图，可以设置方框的边长大小(Block diagram with an asterisk* cyclic process consisting of paintings, you can set the size of the box side)

改变学习板上的2个电位器对应的2段模拟输入，实现模拟输入，学员观察数码管的数字变化情况,通过改D[4]的值，实现模拟输出.(Changing the learning board two potentiometers corresponding paragraph 2 analog inputs, analog inputs, digital tube digital trainees observe the changes, by changing D [4] value for analog output.)

通过红外控制，可以调整时钟的显示数字。lcd显示的年月日可以调整，还具有定时功能。定时可以使电机转动(the IR contorl the lcd)

这个程序实现的是素数判别，里边包含两个文件夹(This program is a prime Discriminant inside folder contains two)

用STM32F407实现有摄像功能，摄像的驱动程序调试通过，配合显示屏才能显示。(With STM32F407 achieve an imaging function, camera driver debugging through, with the display to display.)