28BYJ-48 stepper with WeAct Black Pill STM32F411CE

Wiring for the 28BYJ-48 stepper + ULN2003 driver on the WeAct Black Pill STM32F411CE (STM32F411CE, 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	WeAct Black Pill STM32F411CE pin	Notes
IN1	Input to the part	B12 (PB12)
IN2	Input to the part	B13 (PB13)
IN3	Input to the part	B14 (PB14)
IN4	Input to the part	B15 (PB15)
-	Ground	G
+	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 WeAct Black Pill STM32F411CE’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, PB12, PB14, PB13, PB15);

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:GenF4:pnum=BLACKPILL_F411CE,usb=CDCgen,upload_method=dfuMethod. To upload over USB, hold BOOT0, press and release NRST, then release BOOT0 (DFU mode). An ST-LINK on the SWD pins also works.

Questions

Which WeAct Black Pill STM32F411CE pins do I use for the 28BYJ-48 stepper?

IN1 → B12 (PB12), IN2 → B13 (PB13), IN3 → B14 (PB14), IN4 → B15 (PB15), - → G, + → 5V.

Does the 28BYJ-48 stepper work with the WeAct Black Pill STM32F411CE at 3.3 V?

Yes: the 28BYJ-48 stepper runs at 5 V and the WeAct Black Pill STM32F411CE 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 WeAct Black Pill STM32F411CE pinout · 28BYJ-48 stepper + ULN2003 driver: all pins and data

The 28BYJ-48 stepper on other boards

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