Motor
28BYJ-48 Stepper Motor with ULN2003 Driver
Low-cost geared stepper for precise, low-speed positioning.
A cheap 5V geared stepper motor bundled with the ULN2003 driver board, common in camera sliders and small CNC-style projects.
Specifications
| Motor type | 5-wire unipolar stepper with internal ~1:64 gear reduction |
| Step angle | 5.625°/64 per internal step — roughly 4096 half-steps per output-shaft revolution through the gearbox |
| Operating voltage | 5 V DC (matches the bundled ULN2003 driver board; a 12V-coil variant also exists) |
| Driver IC | ULN2003 Darlington transistor array, 4 inputs (IN1-IN4) |
| Current draw | ~240 mA per phase — low torque, not suited to driving loads heavier than light gears or small pointers |
Pinout
| Pin | Name | Description |
|---|---|---|
| 1 | IN1 | Coil control input 1 — connect to a digital output pin |
| 2 | IN2 | Coil control input 2 — connect to a digital output pin |
| 3 | IN3 | Coil control input 3 — connect to a digital output pin |
| 4 | IN4 | Coil control input 4 — connect to a digital output pin |
| 5 | - | Ground, on the driver board's power terminal |
| 6 | + | Power, 5V DC, on the driver board's power terminal — the motor's 5-pin JST plugs directly into the driver, no separate motor wiring needed |
The motor connects to the driver board via its own keyed JST connector, not loose wires — only IN1-IN4 and the power terminal go to your microcontroller and supply.