kriswiner
commented
8 years ago When you calibrate the gyro and accel, the sensor should be flat and motionless on a table. But when you calibrate the mag, it should be waved around in a figure eight motion so the sensor can sample as much of the 3D response surface as possible. Your mag is not calibrated. When you plot the response surface it should be centered on the origin and reasonably spherical.
-----Original Message----- From: Alekyakoi [mailto:notifications@github.com] Sent: March 7, 2016 1:00 PM To: kriswiner/MPU-9250 Subject: [MPU-9250] Magnetometer calibration (#48)
Hi Kris, I'm trying to run the AHRS with the new NUCLEO cortex M7. The fusion rate is around 8000Hz. But I'm still not able to get any results usable. I calibrated the magnetometer with your magCalibration+ magScale, but I don't understand when I plot my sphere, the resultat is not well centred as you can see in attachment. I'm in 8Hz magneto rate. So It results that the pitch and roll seems correct but the yaw is never correct. During the calibration you said to wawe the device in a figure eight until done, this means that the MPU9250 should lay flat on the table? At the begining I thought It was my �C which was not enough fast for the fusion, but now with the cortexM7 it's couldn't be that, so what do you suggest? It's hard to believe this algo could be run for a camera stabilization, when there is an acceleration on axe X, Y or Z the angles changes or swing, is that the same for you?
Thank you very much Kris
� Reply to this email directly or view it on GitHub https://github.com/kriswiner/MPU-9250/issues/48 . https://github.com/notifications/beacon/AGY1qmc4RgqQpIjz7dW__yY5HRauZ56Wks5 prJHjgaJpZM4HrK-x.gif
alex934
Luhung300897
Hi Kris, I'm trying to run the AHRS with the new NUCLEO cortex M7. The fusion rate is around 8000Hz. But I'm still not able to get any results usable. I calibrated the magnetometer with your magCalibration+ magScale, but I don't understand when I plot my sphere, the resultat is not well centred as you can see:
I'm in 8Hz magneto rate.
So It results that the pitch and roll seems correct but the yaw is never correct. During the calibration you said to wawe the device in a figure eight until done, this means that the MPU9250 should lay flat on the table?
At the begining I thought It was my µC which was not enough fast for the fusion, but now with the cortexM7 it's couldn't be that, so what do you suggest?
It's hard to believe this algo could be run for a camera stabilization, when there is an acceleration on axe X, Y or Z the angles changes or swing, is that the same for you?
Thank you very much Kris