28BYJ-48 stepper with Arduino Nano

Wiring for the 28BYJ-48 stepper + ULN2003 driver on the Arduino Nano (ATmega328P, 5 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

28BYJ-48 stepper pin	Role	Arduino Nano pin	Notes
IN1	Input to the part	D2 (PD2)
IN2	Input to the part	D3 (PD3)
IN3	Input to the part	D4 (PD4)
IN4	Input to the part	D5 (PD5)
-	Ground	GND
+	Power	5V	Motor supply 5 V: use 5V (about 240 mA)

Check before you power it on

Supply: 5 V from the 5V pin.
Motors, servos, relays and LED strips can draw more current than the Arduino Nano’s pins or USB can give. Power them separately and connect the grounds together.

Test code (Arduino)

// Library: Stepper (built in)
#include <Stepper.h>

// 2048 steps per turn; note the IN1, IN3, IN2, IN4 order for this motor
Stepper motor(2048, 2, 4, 3, 5);

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

void loop() {
  motor.step(2048);   // one turn
  delay(500);
  motor.step(-2048);  // and back
  delay(500);
}

Arduino board: arduino:avr:nano. Clones with the old bootloader upload at 57600 baud: choose “ATmega328P (Old Bootloader)” if uploads fail.

Questions

Which Arduino Nano pins do I use for the 28BYJ-48 stepper?

IN1 → D2 (PD2), IN2 → D3 (PD3), IN3 → D4 (PD4), IN4 → D5 (PD5), - → GND, + → 5V.

Does the 28BYJ-48 stepper work with the Arduino Nano at 5 V?

Yes: the 28BYJ-48 stepper runs at 5 V and the Arduino Nano uses 5 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Arduino Nano pinout · 28BYJ-48 stepper + ULN2003 driver: all pins and data

The 28BYJ-48 stepper on other boards

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