Sensors

Interfacing 9-Axis IMU MPU9250 + BMP280 with Arduino

Written by Mohammad Damirchi

MPU9250 + BMP280 Module Features

This module combines a 9-axis MPU8250 IMU and a BMP180 atmospheric pressure sensor. Therefore you have a 10DOF sensor in one place! It can communicate with arduino or any other microcontroller via I2C protocol. Using FreeIMU functions and source code, you can easily build an AHRS system to use in UAVs, VTOLs, model airplanes, etc. You can also use it in industrial, medical, … devices.

MPU9250 + BMP280 Module Pinout

This sensor has 6 pins. 4 pins are more useful:

+3V3: Module power supply – 3.3 V
GND: Ground
SLC: I2C Clock
SDA: I2C data

You can see pinout of this module in the image below.

You can download the datasheet of this module here.

MPU9250 Sensor Datasheet

1 file(s) 939.94 KB

Download

BMP280 Sensor Datasheet

1 file(s) 1.42 MB

Download

Required Materials

Hardware Components

Arduino UNO R3	×	1
MPU9250 + BMP280 Atmospheric Sensor	×	1
Male Female Jumper Wire	×	1

Software Apps

Arduino IDE

Interfacing MPU9250 + BMP280 Module with Arduino

Step 1: Circuit

The following circuit shows how you should connect Arduino to BMP280 module. Connect wires accordingly.

Step 2: Code

Install following library on your Arduino.

https://github.com/adafruit/Adafruit_BMP280_Library

https://github.com/asukiaaa/MPU9250_asukiaaa

Tip

If you need more help with installing a library on Arduino, read this tutorial: How to Install an Arduino Library

Upload the following code to your Arduino.

/*
  by MohammedDamirchi
  Home

*/



#include <MPU9250_asukiaaa.h>
#include <Adafruit_BMP280.h>

#ifdef _ESP32_HAL_I2C_H_
#define SDA_PIN 21
#define SCL_PIN 22
#endif

Adafruit_BMP280 bme; // I2C
MPU9250_asukiaaa mySensor;
float aX, aY, aZ, aSqrt, gX, gY, gZ, mDirection, mX, mY, mZ;

void setup() {
  Serial.begin(115200);
  while (!Serial);

#ifdef _ESP32_HAL_I2C_H_ // For ESP32
  Wire.begin(SDA_PIN, SCL_PIN);
  mySensor.setWire(&Wire);
#endif

  bme.begin();
  mySensor.beginAccel();
  mySensor.beginGyro();
  mySensor.beginMag();

  // You can set your own offset for mag values
  // mySensor.magXOffset = -50;
  // mySensor.magYOffset = -55;
  // mySensor.magZOffset = -10;
}

void loop() {


  if (mySensor.accelUpdate() == 0) {
    aX = mySensor.accelX();
    aY = mySensor.accelY();
    aZ = mySensor.accelZ();
    aSqrt = mySensor.accelSqrt();
    Serial.print("accelX: " + String(aX));
    Serial.print("\taccelY: " + String(aY));
    Serial.print("\taccelZ: " + String(aZ));
    Serial.print("\taccelSqrt: " + String(aSqrt));
  }

  if (mySensor.gyroUpdate() == 0) {
    gX = mySensor.gyroX();
    gY = mySensor.gyroY();
    gZ = mySensor.gyroZ();
    Serial.print("\tgyroX: " + String(gX));
    Serial.print("\tgyroY: " + String(gY));
    Serial.print("\tgyroZ: " + String(gZ));
  }

  if (mySensor.magUpdate() == 0) {
    mX = mySensor.magX();
    mY = mySensor.magY();
    mZ = mySensor.magZ();
    mDirection = mySensor.magHorizDirection();
    Serial.print("\tmagX: " + String(mX));
    Serial.print("\tmaxY: " + String(mY));
    Serial.print("\tmagZ: " + String(mZ));
    Serial.print("\thorizontalDirection: " + String(mDirection));
  }

  Serial.print("\tTemperature(*C): ");
  Serial.print(bme.readTemperature());


  Serial.print("\tPressure(Inches(Hg)): ");
  Serial.print(bme.readPressure()/3377);


  Serial.print("\tApproxAltitude(m): ");
  Serial.print(bme.readAltitude(1013.25)); // this should be adjusted to your local forcase


  Serial.println(""); // Add an empty line

  }

After uploading the code, by moving the module, you can see the output in the serial monitor.

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Contents

Interfacing 9-Axis IMU MPU9250 + BMP280 with Arduino

MPU9250 + BMP280 Module Features