SmartMotion® MEMS Motion Sensors

G'day,

I've read through this document from STMicroelectronics, regarding the calculation and application of compensation values/matrices to pre- or post-fused accelerometer/gyroscope data to account for incorrect module installation (with respect to the desired reference orientation).

Hello,

It seems to me that there is an issue about the usage of MPU-9250 on Thingy 52 device. I mentioned about this problem to Nordic and they said that your driver (6.12) makes the gyro, magnetometer and accel raw data fusion algorithm so I just want to seek help from you.

I motioned Thingy and I observed its movement on the app. In all movement combination, SDK finds Thingy' s location perfectly (I can see it on the app) except for one movement.

Now, I am trying to explain this problematic movement.

It seems that common we use DMP through the pre-defined function calls, such as dmp_enable_lp_quat(). I am wondering whether there is a way to program the DMP directly. For example, I want use DMP to do window averaging for the Gyro and Accel readings. Is it possible to do that?

Thanks,

I am utilizing the motion driver 6.12 with SPI communication following the app notes. While porting to the nRF52582 by Nordic Semiconductor the firmware fails at setting up the compass. The BYPASS_EN is set in the int_pin_cfg and then four SPI communications are sent to the MPU9250 0x80, 0x80, 0x80 and 0x80. I think these are an attempt to ask the AKM who it is, are you 0x0C, 0x0D, 0x0E, or 0x0F. My ported firmware utilizes SPI communication and fails to utilize device address as it is not necessary with SPI.

Hi, can I connect the breakout board ICM 20789 to an Arduino module and run it and the I2C-communication with the gyro part on 3,3 volts? As I read the datasheet it should be ok butI get a bit nervous with references to the 1,8 volts supply....
Grateful for any comment on this!

Leif

I am porting the eMD-6.12 to nRF52832 by NordicSemiconductor. Currently, I am trying to compile the stm32L arm project with a gcc toolchain via makefile. The compiler has no definition of the underscore types inside the mpu.h file: __u16, __u8, __u32, __s32, and the like. I see the __KERNEL__ and __LINUX__ branches to include ioctl. and types.h, but these files are not part of the eMD-6.12 package. I also see mltypes.h is included but have not seen a definition of the underscore types.
Question: how to include the definitions of the underscore types?

I'm looking for comprehensive initialization functions and application notes for the ICM20948. Preferably in C or C#, but I'll take what I can get.

Hi InvenSense,

We cannot find any performance specs on the angle output from the sensor fusion filer in the datasheet. Most other IMUs providers have these (very important) specs in their datasheets e.g. on p.7 in XSENS or p. 48 in BOSCH BNO080.

We are looking for Roll/Pitch and Yaw (dynamic) angle errors.

Could you please provide specifications?

Thanks,
Andreas

Hi Everybody,

I am trying to develop a mouse application using mpu9250 and nRF52.i am able to flash the code and able to connect to host using Bluetooth and there is no cursor movement as supposed to be with mpu9250 when i move the mouse hardware on a flat surface.Also I used the Invensense motion driver.

Can anyone help me on this???

Thanks in Advance,
susmith

Good morning everybody,

I have a question about the accelerometer of the MPU9250, in the datasheet it is written that