PinoutSearch

Spin a Stepper Motor (28BYJ-48 + Arduino)

Turn a 28BYJ-48 stepper one revolution each way through its ULN2003 driver. Learn the Stepper library.

Beginner20 min

What you need

Wiring

Arduino Uno
28BYJ-48 stepper

Hover a pin or a wire to trace the connection.

Code

stepper.ino
// Rotate a 28BYJ-48 one revolution each direction.
#include <Stepper.h>

const int stepsPerRev = 2048;             // 28BYJ-48 (geared)
// ULN2003 coil order for the Stepper library: IN1, IN3, IN2, IN4
Stepper motor(stepsPerRev, 8, 10, 9, 11);

void setup() {
  motor.setSpeed(10);   // RPM
}

void loop() {
  motor.step(stepsPerRev);    // one turn clockwise
  delay(1000);
  motor.step(-stepsPerRev);   // one turn back
  delay(1000);
}

Steps

  1. Wire IN1–IN4 to D8–D11; power the driver board from 5V (external supply preferred).
  2. Note the library pin order is IN1, IN3, IN2, IN4 — that's why the code reads 8, 10, 9, 11.
  3. Upload — the shaft turns one revolution each way.
  4. If it just buzzes, check the coil order and use a separate 5V supply.