M5Gray_MPU6886_BMM150 for arduino IDE

This is M5Stack Gray MPU6886+BMM150 examples for arduino IDE.

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BMM150class.cpp and BMM150class.h were forked from omegatao's repository. Original link (platform IO based) https://github.com/omegatao/M5StackGrey_MPU6886_BMM150_AHRS_sample

What's New ?

• Added soft iron distortion correction.

Simple and Effective Magnetometer Calibration Kris Winer edited this page on 15 Aug 2017 · 17 revisions

• Added gyro offset calibration. However, built in M5.IMU.setGyroOffset(Ωx0,Ωy0,Ωz0) is not used. It starts automatically. (still has gyro drift. but reduced a little)
• yaw tweaked 90 degrees (button A,B,C are front side)

Usages

• Copy BMM150 folder into your arduino libraries folder.
• Some .ino files are required lovyanGFX and lovyanlancher.
• M5Stack-SD-Updater version must be 0.5.2 (1.x or higher will not work in my code. I don't know why) 1.0.x is OK now. Verified arduino 1.8.15
• tilt_compass.ino is traditional tilt-compensated compass. Not using 9-AXIS quaternion.
• Do not move or tilt your M5Stack during the gyro offset calibration.
• Do not use this unit in situations involving safety to life.
• - Not supported M5Unified library. (Consider M5Stack.h library depandency such as I2C, etc.)
• Added example code using M5Unified library.

References

• https://github.com/BoschSensortec/BMM150-Sensor-API
• https://github.com/m5stack/M5_BMM150
• https://github.com/m5stack/M5Unified
• https://x-io.co.uk/open-source-imu-and-ahrs-algorithms/

Revision history

• 2021-Jan Initial release.
• 2021-Feb updated Readme.md, added built in sensor's orientation images.
• 2023-Jan Modified I2C part and added example code using M5Unified library.
• 2024-Feb added destructor and year 2024 Ehou-roll.

Have fun !