fresh_ros_user's profile - activity

Dear all,

I have an IMU. Even if I have made the calibration of the accelerometer, it still gives me the wrong distance value of the robot when I integrate the acceleration twice. And after the movement(when I stopped the robot), the acceleration is always different from zero. How can I fix these problems?

Thanks for your helps.

It depends on the IMU that you're using. Each style of hardware has it's own calibration protocol. Often, manufacturers provide an executable file for calibrating their IMU. Sometimes, people have written their own versions. If you provide the IMU model you're using, I might be able to help you further.

I use "STEVAL-MKI062V2 iNEMO V2". I will appreciate if you help. Thanks for your interests.

I am new at those calibration stuff. I need to calibrate the accelerometer which is on imu. Could you tell me step-by-step how to do it? Thanks!

If you play back the bag, you can use:

rostopic echo -p /topic_name

to display the data in a MatLab-friendly format. You can output this to a text file with:

rostopic echo -p /topic_name > data.txt

Or, you can even convert a topic directly to CSV with:

rostopic echo -b file.bag -p /topic

NOTE: This will only work with simple message types. LaserScans, PointClouds, arrays, etc won't work very well because the entire message is rendered to text.

The other option would be to use the rosbag API, located here to load the data into a C++ program and manipulate it that way.

I have datas in bag file such as velocity and acceleration from the sensors. I want to read data with respect to time domain to make calculations in Matlab. How can I gain the data and use in Matlab? Thanks for your answers.