直流步进电机键盘控制LCD显示菜单，+为开始进入，4为切换 ，7为进入子菜单，stepping motor 为步进电机，2控制转速，0控制节拍，MOtor v3000为直流电机，8正转，7反转PWM控制-DC stepper motor keyboard LCD display menu,+ is entered, 4 switching, 7 to enter the sub-menu, stepping motor as a stepper motor, 2 speed control, 0