BMM150 (GY-BMM150) 3-axis magnetometer with ESP32

Supply 3.3 V Bus I2C I2C address 0x10 / 0x11 / 0x12 / 0x13 Measures magnetic field, heading

Pins and ESP32 wiring

Pin	Role	ESP32 pin	Notes
VCC	Power	3V3	Use 3V3. Pin order differs between sellers: check the silkscreen
GND	Ground	GND
SCL	I2C clock (SCL)	D22
SDA	I2C data (SDA)	D21
CSB	Not wired to the ESP32	—	Address bit / SPI select. Sets the address with SDO (0x10 to 0x13)
SDO	Not wired to the ESP32	—	Address bit. Sets the address with CSB (0x10 to 0x13)
INT	Interrupt	D35	Interrupt output, optional
DRDY	Interrupt	VP	Data ready, optional

Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.

Starter code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin(21, 22);  // SDA = GPIO 21, SCL = GPIO 22
  Wire.beginTransmission(0x10);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "BMM150 (GY-BMM150) 3-axis magnetometer found at 0x10" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Sources

Bosch BMM150 datasheet, Register 0x40 chip ID reads 0x32 only after the power control bit (0x4B bit 0) is set
Bosch BMM150 datasheet, I2C address 0x10 to 0x13 selected by CSB and SDO

Try it in 3D in BoardPilot

BoardPilot Part data (JSON)

Part data: CC BY 4.0, free to reuse with credit to BoardPilot.

BMM150 (GY-BMM150) 3-axis magnetometer with ESP32

Pins and ESP32 wiring

Starter code (Arduino)

Sources

Try it in 3D in BoardPilot

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