Bipolar motor and Arduino with a Darlington Array - circuit modifications - Electronics Forums

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ElectroNick

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One of our visitors, Thomas, is reporting that the motor in the circuit described in the original post Driving a Bipolar Stepper Motor with Arduino and ULN2803AG continues to operate even with pull up resistors R1-R4 removed.

I'm scratching my head  :-\  Anyone knows if there could be enough current passing through the ULN on the output that's supposed to be open to sustain rotation of a small rotor?

Thomas, if you can describe it in more detail, I would appreciate that!

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