28BYJ-48 stepper with NUCLEO-F401RE

Wiring for the 28BYJ-48 stepper + ULN2003 driver on the NUCLEO-F401RE (STM32F401RE, 3.3 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	NUCLEO-F401RE pin	Notes
IN1	Input to the part	D2 (PA10)
IN2	Input to the part	D4 (PB5)
IN3	Input to the part	PWM/D5 (PB4)
IN4	Input to the part	PWM/D6 (PB10)
-	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 NUCLEO-F401RE’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, PA10, PB4, PB5, PB10);

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

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

Arduino board: STMicroelectronics:stm32:Nucleo_64:pnum=NUCLEO_F401RE. Plug the USB cable into the mini-USB port on the ST-LINK end. No button press is needed.

Questions

Which NUCLEO-F401RE pins do I use for the 28BYJ-48 stepper?

IN1 → D2 (PA10), IN2 → D4 (PB5), IN3 → PWM/D5 (PB4), IN4 → PWM/D6 (PB10), - → GND, + → 5V.

Does the 28BYJ-48 stepper work with the NUCLEO-F401RE at 3.3 V?

Yes: the 28BYJ-48 stepper runs at 5 V and the NUCLEO-F401RE uses 3.3 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 NUCLEO-F401RE pinout · 28BYJ-48 stepper + ULN2003 driver: all pins and data

The 28BYJ-48 stepper on other boards

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