kriswiner / mmc5983ma

Arduino sketch for 10 DoF AHRS using the MMC5983MA magnetometer

MMC5983MA

Arduino sketch for 10 DoF AHRS using the MMC5983MA magnetometer

The MEMSIC MMC5983MA is an AEC-Q100 qualified complete 3-axis magnetic sensor with on-chip signal processing and integrated I2C/SPI bus suitable for use in automotive applications. Coupled with the ST LSM6DSM accel/gyro and LPS22HB barometer the system provides a compact and accurate absolute orientation estimation engine.

We are getting pretty good results with this magnetometer!

Uses the I2C interface at 400 kHz for data transfer.

Intended to be run on a Dragonfly development board.

Breakout board design files are open-source and available in the OSH Park shared space.

Copyright 2020 Tlera Corporation. May be used by anyone with proper attribution.

mmc5983ma's Issues

Pitch and roll angle change in linear motion

Hello Kris,
I tested this code on dragon fly board. I see changes in Pitch and roll angle outputs when sensor is subjected to linear motion.
I don't think this is desired. Is there any fix for this?

Thanks.

MMC5983MA_offset

Hi kriswinear were do you get the MMC5983MA_offset = 131072.0f ?
https://github.com/kriswiner/MMC5983MA/blob/master/LSM6DSM_MMC5983MA_LPS22HB_Dragonfly/LSM6DSM_MMC5983MA_LPS22HB_Dragonfly.ino#L118

Reading from MMC5983MA write-only control registers

The MMC5983MA datasheet labels the four control registers as write-only.
In a couple of places you do:
uint8_t temp = _i2c_bus->readByte(MMC5983MA_ADDRESS, MMC5983MA_CONTROL_2); // read register contents
This seems incorrect?

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