SmartMotion® MEMS Motion Sensors

Hello Guys,

I am currently starting on a product that needs an IMU to get orientation and speed information. For the orientation part the easiest way (in my opinion) is to select an IMU with a DMP that supports quaternion output. I have experience using the MPU-9150 and it looks like the MPU-9250 would be the perfect choice. However, we need to evaluate cheaper alternatives, perhaps even without magnetometer as we can derive and correct the absolute orientation (more or less) by finding the gravity vector in the accelerometer data.

Hi every body! i try to make a MPU9250 with I2C communication circuit on PCB board. i use this schematic but doesn't work i can't find the adress of my mpu9250. i forgot to place a pull up resistance for nCS. does that can be the problem !!

Hi,
I am using a MPU6050 to control an autopilot on my leisure boat. I only use the Z axis of the gyroscope.
In this special application, I need a very high sensitivity and moreover, a very high zero offset stability, for the used range for the rotational speed is only 2 deg/s. To keep in a straight line, I must stay within 1/100 deg/s.
I have observed large variations due to temperatures, and so far, I manually recalibrate the gyro periodically.

Hi…..

I am using mpu9250 sensor. At the output of accelerometer, I got stable value in only ax and az axis. Not in ay axis.

So what I do for stable ay axis.

I received data on all Accel full scale i.e. ±2g, ±4g, ±8g, ±16g. But same output received.

At the time of reading sensor is stable. (not moving)

Please give me suggestion soon.

Please find the attachment.

Thank you…

Hello,
We're using the ICM-20948 DMP for a project to get Quaternions. The problem is the sign flips very often (sample value is negated on all four components between two consecutive samples), which creates discontinuities in our signal (image attached).

I am aware that this is a valid representation of a quaternion (since +Q and -Q represent the same orientation), but this representation isn't compatible with our application.

Hi,

I am using MPU9250 sensor, integrated with ARM controller. I am reading PEDO_STEP_COUNT register to get the step count. The value which got from the sensor is not accurate. It always lesser than actual steps.while I am taking 2 steps, most of the time one step only getting incremented.
I adjusted PEDO_PEAK_THR register ,still i could not able to fix this problem.

Please help me to solve this issue.

Thanks,
Sarathkumar

Hi,

I'm using a mpu9250 and I'm triying to use MPL (MotionDriver) to obtain a 9-axis sensor fusion, but my problem is that the first component resultant from quaternion (w) is always 0.

Using the function 'int inv_get_sensor_type_quat(long *data, int8_t *accuracy, inv_time_t *timestamp)', when I acces to data[0] always is 0, the others 3 components (data[1],data[2] and data[3]) from the quaternion at least they change when I move the chip.

Any idea why is this happening?

Thanks in Advance,

Miguel

Hi,
I´m trying to figure out why the ICM30630 is not responding after setup. I´m running the GetAccelerometerData example sketch on a Arduino Zero with the ICM30630 shield. I have been unable to find any explanation to what Error -4 means...
BR carl

can we change the Accelerometer sampling frequency of MPU-6050 ? and how?

Is It possible to make transformation movement by using Accelerometer data or Accel + Gyro ?
as we know, we can make rotation by using Accel or Gyro data.
However, how can we make transformation movement?
I know this is still problematic and experimental. but there must be some ways to reach.

Is there any algorithm or math formula solving this problem?