一款四象限步进电机控制系统，精度低于3度，核心功能是锁定目标后，机器可以全自动跟随目标转动，并且有自动重设功能。-A four quadrant stepper motor control system, the precision is less than 3 degrees, the key function is that when there a target, the machine can automaticly rotate following the target, and th