用arduino的单片机接DM542驱动器来控制57步进电机。采用共阴极接法，即ENA不接，PUL-与DIR-串接单片机GND,PUL+接单片机9口给脉冲，DIR+接8口给高低电平（高电平正转，低电平反转）,驱动器输出端A+ ...
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