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The 28BYJ-48 is a 5V unipolar stepper motor sold together with its matching ULN2003 driver board, a combination widely used for small robotics and Arduino projects needing precise, repeatable rotational movement. It is a 5-wire unipolar design with a 64:1 gear reduction inside the motor housing, which converts the motor's own faster internal rotation into a slower, higher-torque output at the drive shaft, roughly 15 RPM in typical use.
Running it on the recommended half-step mode, using an 8-step control signal sequence, gives smoother rotation and finer positioning resolution than full-step operation, at the cost of needing twice as many control steps per full revolution.
Because the motor and driver are sold as a matched pair, the motor's cable plugs directly into the ULN2003 board using a standard connector, without needing to work out wiring by hand. The driver board itself includes four LED indicators, one for each of the A, B, C and D phases, which light up in sequence as the motor steps, giving a simple visual check that the driving signal is working correctly.
Its compact size and low cost make it a common first stepper motor for beginners, and its gear reduction gives it noticeably more holding torque at low speed than a similarly sized ungeared stepper motor would provide.
Beginners and hobbyists building small robot arms, camera pan mechanisms, automated dial indicators or any project needing slow, precise rotational movement will find this ready-matched motor and driver pairing an easy, well-documented starting point.
A 5-wire unipolar stepper motor.
64:1.
A matching ULN2003 driver board.
Half-step mode, using an 8-step control signal sequence.
Approximately 15 RPM.
| Brand | Generic |
|---|---|
| Driver IC | ULN2003 |
| Selling unit | PCS |
