MPU6050 with WeAct Black Pill STM32F411CE

Wiring for the MPU6050 (GY-521) accelerometer + gyro 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

MPU6050 pin	Role	WeAct Black Pill STM32F411CE pin
VCC	Power	3V3
GND	Ground	G
SCL	I2C clock (SCL)	B6 (PB6)
SDA	I2C data (SDA)	B7 (PB7)
INT	Interrupt	A0 (PA0)

Check before you power it on

Supply: 3.3 V from the 3V3 pin.
I2C uses the board’s default pins B7 (SDA) and B6 (SCL). Most modules include pull-up resistors; if the part is not found, check them and swap-test SDA/SCL.
To make sure it is the real chip, read register 0x75: a genuine part answers 0x68.

Test code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin();  // SDA = B7, SCL = B6 (the board's default I2C pins)
  Wire.beginTransmission(0x68);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "MPU6050 (GY-521) accelerometer + gyro found at 0x68" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

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 MPU6050?

VCC → 3V3, GND → G, SCL → B6 (PB6), SDA → B7 (PB7), INT → A0 (PA0).

Does the MPU6050 work with the WeAct Black Pill STM32F411CE at 3.3 V?

Yes: the MPU6050 runs at 3.3-5 V and the WeAct Black Pill STM32F411CE uses 3.3 V signals, so no level shifting is needed.

What is the I2C address of the MPU6050?

0x68 or 0x69. An I2C scan (BoardPilot does it for you) shows which one your module uses.

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 · MPU6050 (GY-521) accelerometer + gyro: all pins and data

The MPU6050 on other boards

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