51常用子程序。包括：液晶，ad，da，音乐播放，打印，电机，查表，通讯等等好多好东西。-51 commonly used subroutines. Include: LCD, ad, da, music players, printing, electrical, inventory, communications and so on a lot of good things.

伺服电机转速控制,采用了嵌入式内模控制，PID控制以及状态反馈控制-control of servo motor

基于SEED DM 6437的电机拖动程序-SEED DM 6437 motor drag program