说明：  这是一个基于51平台的调速系统的程序，系统对转轮能进行测速，并在液晶屏上显示当前转速。也能通过键盘设置转轮的转速，此时屏幕上能显示设置转速和当前转速，最终系统将能自动调整到设置值！
(This is a platform-based speed control system 51 of the procedures, the system can be carried out on the wheel gun, and the LCD screen displays the current speed. Keyboard can also set the wheel rotation speed, when the screen display settings to speed and current speed, and ultimately the system will automatically adjust to set a value!)