SmartMotion® MEMS Motion Sensors

Hi all,

I am having technical difficulty with the mpl library. In particular, I am getting a hardfault when inv_start_quaternion() is called by pointer via the inv_start_mpl() function. Here is my relevant code:

We just received our MPU-9250EVB board, and I noticed the U2 footprint for the AK8963C magnetometer is populated. I thought the MPU-9250 had the AK8963 magnetometer built into it, already hanging right off the AUX I2C bus?

I just noticed that R12 and R14 which connect it to the AUX I2C bus are supposed to be "open" on the board. I'll have to check it with my magnifiers. It seems that it's connected to the main I2C bus, so it can be addressed if necessary. But why have it on there at all, given that this board is made with the 9250?

Hello,

The self test fails consistently for the gyro and accelerometer on all my boards with MPU9250, but other than that, the sensors seem to work fine and all sensors give me reasonable values on all axes. What could be the reason?

Hello,

What is your solution for automotive dead reckoning based on GNSS, MEMS, vehicle speed, etc? I have found a reference to the InvenSense Positioning Library (IPL) but can't find any detailed information.

Thanks,
Samir

Hi,

we are developing a health monitor and are currently discussing if we will use a Invensense MPU-6555 or a ST LSM6DSM.

Power consumption is critical for us, so how much AVERAGE power would the MPU-6555 consume when sampling the accelerometer and Gyro at a 1Hz rate and using the DMP? Also tell me if my parameters are correct, we basically want to detect change between sleeping and waking up in an infant.

I hope you can answer this question,

Best regards,

Patrick

Hello,
I’m using the CA SDK Board (MSP430 with MPU-9250) for accel. Measurements. With the preload Software the maximum frequency can be set to 100 Hz. How can I increase it? I need around 1 kHz. I tried the following, but it didn’t worked, I still get 100 Hz:

mpu_set_sample_rate(10000);

inv_set_accel_sample_rate(1000L);

In the source code it is written "Clock can not be set for more than 50 Hz!". Is this just when I use the dmp?

Hi,

We are using MPU9150's DMP gyro calibration (dmp_enable_gyro_cal) to enable the automatic gyro calibration by DMP. It works fine (the gyro drift is very small).

However, if our robot is rotating very slowly (Z axis), the automatic gyro calibration suddenly takes place WITH movement.

QUESTION: How can we reduce the threshold for the 'no-motion' trigger needed by the automatic DMP gyro calibration? (we need the automatic gyro calibration feature ON because we cannot use a compass with our motors)

Thanks,
Alexander

Folks,

I've been trying for days and days to get sensible readings out of my MPU-9250's accelerometer registers. I've found a few open source projects on line, read through the incredibly sketchy and basic datasheets, downloaded the almost unfathomable Motion Driver software and have got absolutely nowhere. I've gone through the example in the datasheet line by line where it gives an example of setting up to interrupt on movement and get no response when I move it.

Hi,

I am confused as to whether or not it is possible to calibrate the MPU-6050 when it is mounted vertically. In our application the circuit board will be vertical. I can only complete calibration with z perpendicular to the ground. Is this correct? I expected it to be able to be mounted in any of the 24 possible orientations provided at least one of the three axes was in the same direction as gravity or must this be z?

Thanks.

Jolyon

The document InvenSense CA-SDK 5.1.1 states that "The option to load the program through BSL requires the existing software on the CA-SDK Board to have a BSL jump with a user interface. The software that is pre flashed on all CA-SDK boards that are shipped does come with the option of pressing the button to put the CA-SDK in BSL where the user can update their software using USB interface. A similar interface is recommended for any software updates from the developer to make this feature available.