28BYJ-48 Stepper + ULN2003 Driver
by Generic
SKU: PSA-CMP-STEPPER-28BYJ
No reviews yetTypical India street price
₹90–₹180
Cheap geared stepper for precise angles (clocks, turrets).
Interface: 4-wire unipolar via ULN2003
Always drive through an H-bridge (L298N/TB6612), never from a GPIO pin.
Connect motor terminals to driver OUT; driver IN/PWM to MCU.
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Concept
Steppers move in discrete steps, not continuous spin like a DC motor.
A little theory
64:1 gearbox × 32 steps/rev internally ≈ 2048 steps/rev output (half-step 4096). Unipolar coils, ULN2003 darlington sink. In the classroom, treat 28BYJ-48 Stepper + ULN2003 Driver as a intermediate part using 4-wire unipolar via ULN2003. Typical India street price is about ₹90–₹180. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
AccelStepper or Stepper.h with 4 pins. Sequence energizes coils in order.
Classroom & project use
- Plotter
- Camera slider intro
- Combination lock dial
Buying in India
Precautions
- Low torque — don’t stall hard
- 5 V only
Specifications
| Voltage | 5V |
| Steps/rev | ~2048 (full) |
| Category | Motors & Servos |
| Difficulty | Intermediate |
| Interface | 4-wire unipolar via ULN2003 |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
