说明：  此代码是有关一种智能无线通信小车的源代码！无线通信小车的功能通过上位机控制实现是走固定长度的路线，画圆，转角等等。
(This code is related to an intelligent wireless communication vehicle of the source code! Trolley function of wireless communication through the host computer control to achieve is to take a fixed length of line, circle, angle and so on.)