SmartMotion® MEMS Motion Sensors

Hello.

Hi All,

I have been working with MPU-9250 for indoor application, where distance will be calculated for one round of walk for human. HW device is installed near shoe or leg as per need in distance measurement algorithm.
I have searched Internet to get some simple sweet solution, but I am unable get such solution. Do anyone has such solution in hand?
Also you can suggest me all possible ways to measure distance with help of MPU-9250, and which is best way.

I am using MPU9250 and reading raw accelerometer from DMP FIFO for dead reckoning type of application.

What I noticed is that with linear movement occurring along one axis (say y ), accelerometer reports not only acceleration on y, but also acceleration on other axis (say x), such cross-interference often can be as large as the acceleration on the correct axis.

Can anyone share your experience one this type of test for MPU9250 ? Would like to find out if this is the limitation of MPU9250, or a configuration, setup issue .

Hi

I would like to know if it is possible to trigger the int pin
when there is DRDY on the magnetometer side. I can see the interrupt
trigger when accelerometer and gyroscope are enabled but the pin
never goes high when I only have magnetometer enabled.

We just brought up a 20 boards for a prototype. We are measuring gravity on the z direction.

On the boards that seem to work properly, we measure 1g with the chip facing up, -1g when the chip is facing down.

On the boards that are not behaving:

Chip facing up: 0.86g
Chip facing down: -1.16g

Do you know of anything that would cause this? I am wondering if this is a hardware or software problem based on others who have already experienced this? If hardware, was there external passive components (capacitors) that caused this?

Thanks,

Rob

Where is the Applications Note : Programming Sequence for DMP Hardware Functions ?

Hi.
I use MPU9250 & nRF52.

I want to read fifo-buffer for get data of quaternion that made by DMP.

But I couldn't read fifo-buffer well.
I read fifo_count register(0x & x), first time, it's 242,after this,512 all the time.
I think fifo_count is 0, next 22, next 44... increase by 22.
And data in fifo-buffer is almost 0 or 255.

Is it wrong how to read fifo-buffer？

Thanks,

Hello Invensense,

We are using MPU in our design. It is detected on the IC bus and with that gyroscope and akm (xc) are working. We are observing strange issue with the accelerometer.

We have few debug boards on which the MPU is mounted and on few boards, only Axis-Y and Axis-Z are reported and on few boards, only Axis-Z is reported. We are not getting Axis-X reported on any of the sensors. Basically, it's value is not getting changed after enabling the accelerometer. Please check attached register dump.

Thanks.

Hi Invensense,

Now I have a problem about low power Accel mode. Suppose there is an equipment using MPU9250, being standby and to be woke up by MPU9250. In low power Accel mode, the maximum is 0-1020mg(about 1g). However, if I want to ship this equipment to other region, the vibration of vehicle is inevitable and the vibration may above 1020mg. How to let MPU9250 avoid being woke up without shuting the power, when shipping?

Thanks.

Hi,

I have successfully ported Motion_driver_6.12 msp430 project to IAR EW for MSP430. But I need mpl library to build and compile project. There are many library for IAR EW for ARM, but i did not find any library for IAR EW for MSP430.

Please provide libmpllib.a for MSP430 IAR EW.

Thanks

Abdul Sattar