SG90 servo with WeAct Black Pill STM32F411CE

Wiring for the SG90 micro servo 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

SG90 servo pin	Role	WeAct Black Pill STM32F411CE pin	Notes
GND	Ground	G	Brown wire
VCC	Power	5V
SIG	Input to the part	B12 (PB12)	Orange wire. 50 Hz PWM, 0.5 to 2.4 ms pulses

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: Servo
#include <Servo.h>

Servo servo;

void setup() {
  servo.attach(PB12);
}

void loop() {
  servo.write(0);
  delay(1000);
  servo.write(90);
  delay(1000);
  servo.write(180);
  delay(1000);
}

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 SG90 servo?

GND → G, VCC → 5V, SIG → B12 (PB12).

Does the SG90 servo work with the WeAct Black Pill STM32F411CE at 3.3 V?

Yes: the SG90 servo 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 · SG90 micro servo: all pins and data

The SG90 servo on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the WeAct Black Pill STM32F411CE

BME280 BMP280 DHT22 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 TM1637 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20