WS2812B LED strip with WeAct Black Pill STM32F411CE

Wiring for the WS2812B addressable LED strip 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

WS2812B LED strip pin	Role	WeAct Black Pill STM32F411CE pin	Notes
5V	Power	5V	Use 5V for a few LEDs; a separate 5 V supply for more (up to 60 mA per LED)
DIN	Input to the part	B12 (PB12)	Data in. Add a 330 Ω resistor; a 3.3 V to 5 V level shifter makes it reliable
GND	Ground	G

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: Adafruit NeoPixel
#include <Adafruit_NeoPixel.h>

Adafruit_NeoPixel strip(8, PB12, NEO_GRB + NEO_KHZ800);  // 8 LEDs

void setup() {
  strip.begin();
  strip.setBrightness(40);  // keep it low when powered from USB
}

void loop() {
  for (int i = 0; i < strip.numPixels(); i++) {
    strip.clear();
    strip.setPixelColor(i, strip.Color(0, 80, 255));
    strip.show();
    delay(100);
  }
}

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 WS2812B LED strip?

5V → 5V, DIN → B12 (PB12), GND → G.

Does the WS2812B LED strip work with the WeAct Black Pill STM32F411CE at 3.3 V?

Yes: the WS2812B LED strip 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 · WS2812B addressable LED strip: all pins and data

The WS2812B LED strip on other boards

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