kriswiner
commented
6 years ago No idea.
I would first make sure the heading pitch and roll makes sense on the board output. If you point the board toward North, do you see heading of ~0 degrees? if you then point it Eastward, do you see 90 degree?
If you face the board up, do you read 0 degrees for pitch and 180 degrees for roll? When you tip Eastern part of the board upward, does roll become more positive?
When you dip the North end of the board downward, does the pitch become negative?
Simple tests to see if you have the AHRS implemented properly on the board. If so, then yes, there could be a mismatch between the coordinate systems of the board and the display.
On Sun, Apr 8, 2018 at 7:33 AM, Simon Sassi notifications@github.com wrote:
Dear,
I'm a highschool student, and I have to make a robot as a final exam project. I'm in charge of the robot's orientation & Bluetooth transmission. So we bough an IMU 10DOF Grove http://wiki.seeedstudio.com/Grove-IMU_10DOF_v2.0/from seed studio, which works with a MPU9250 device. I have searched "How can I get the orientation using an IMU board?", and discovered the Madgwick filter (I don't understand the maths, it's beyond me)
In order to get the orientation, I forked one of your skecth, MPU9250_BMP280_BasicAHRS_t3.ino https://github.com/kriswiner/MPU9250/blob/master/MPU9250_BMP280_BasicAHRS_t3.ino .
I have made some changes to the Arduino Sketch:
- In order to receive the orientation & some infos, the arduino board print serial normalized infos (Yaw, pitch, roll.
- I've made a new var for the informations printing interval.
For the 3D simulation part, I'm using processing, Processing https://processing.org/, a visual art language based on java.
Here is a video of my experiment : [image: Video] https://streamable.com/nwq73
The source code (Arduino & processing sketch) is available at : https://github.com/RISE-Project-STI2D/3D-Orientation- IMU-10DOF-MPU9250-Test-Grove
It is actually working, my problem is: I don't get the same orientation as my display. It's sort of inverted, when I rotate the IMU in a direction, on the display it rotates to another direction What I'm looking for, is just to synchronize the IMU orientation with the display, and make them correspond when you rotate, like this video https://www.youtube.com/watch?v=BXsGWoOMtmU.
I was wondering if it was related to a NED frame, or something else. Do you have an idea on the problem ?
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maxerbox
Dear,
I'm a highschool student, and I have to make a robot as a final exam project. I'm in charge of the robot's orientation & Bluetooth transmission. So, in oder to perfom that task, we bough an IMU 10DOF Grove from seed studio, which works with a MPU9250 device. I have searched "How can I get the orientation using an IMU board?", and discovered the Madgwick filter (I don't understand the maths, it's beyond me)
In order to get the orientation, I forked one of your skecth, MPU9250_BMP280_BasicAHRS_t3.ino.
I have made some changes to the Arduino Sketch:
For the 3D simulation part, I'm using Processing, a visual art language based on java.
Here is a video of my experiment :
The source code (Arduino & processing sketch) is available at : https://github.com/RISE-Project-STI2D/3D-Orientation-IMU-10DOF-MPU9250-Test-Grove
It is actually working, my problem is: I don't get the same orientation as my display. It's sort of inverted, when I rotate the IMU in a direction, on the display it rotates to another direction What I'm looking for, is just to synchronize the IMU orientation with the display, and make them correspond when you rotate, like this video.
I was wondering if it was related to a NED frame, or something else. Do you have an idea on the problem ?