This board can be used as a stepper motor robot arm driver and has the following functions
①Can drive three-way stepper motors ( 32 subdivisions, maximum current 4A per channel)
Three-stack board design, each board drives a motor, connect 0Ω resistor to select pin header wiring
②Encoder closed-loop feedback: Optocoupler isolation protection (since only the pins of TIM1 and TIM8 are led out in encode mode, only two feedback channels are taken from the three motors)
③Add a small fan
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