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Wiring with Arduino
Here are schematics showing how to interface a unipolar stepper motor to four controller pins using a ULN2003A, and showing how to interface using four TIP120's.
- IN1-4 to the MCU IOs
- The pins in the white jack (from left to the right) are: Motor VCC, A, B, C, D (to the stepper motor)
- Power switch pins: GND, VCC, VCC, Motor VCC, use jumper to choose using shared VCC or not.