A modified version of the official Arduino library exclusively for the stepper motor 28BYJ-48 (with the board ULN2003) as the official version doesn't work properly with this stepper motor.

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Check out the video below to learn more about its construction using four 28BYJ-48 stepping motors an SG90 servo connected to the Arduino development board.

Motion is provided by a 28BYJ-48 stepper which is connected to the drive nut by way of a belt. The spinning nut is used to raise and lower the threaded rod which opens and closes the “door”.