kriswiner
commented
6 years ago If there are variable, external magnetic fields present from otors/wires whatnot the best you can do is use the accelerometer to detect and correct these magnetic field anomalies. it would take a bit of doing to come up with an algorithm for doing so but this might be a fun task. We generall use the EM7180 https://www.tindie.com/products/onehorse/ultimate-sensor-fusion-solution/ to avoid this issue, which has magnetic anomaly detection/correction built in. So maybe this would be an easier solution?
On Tue, Apr 10, 2018 at 10:51 AM, RicardPalo notifications@github.com wrote:
Hello Kris, I'm doing a project about a self guided robot car, so I use the MPU9250 as compass. I have followed your codes and calibration advices. The problem is that after calibrating the MPU9250 I obtain good results, but only on the point I've made the calibration. When I calibrate the sensor, the robot car is stopped and the yaw is good. But when the car moves to another position (because the car has to follow a path), sometimes the yaw gotten is really different than what it should be.
I suppose that it is happening because of another magnetic fields. When I move the car keeping it 1.5 metres away from the ground, the yaw remains good. Maybe there ara magnetic fields under the ground generated by wiring or something?
I'm a little lost, because I don't know what I can do. Maybe make the calibration in different points where I know the car will pass through, and then take the magbias averages?
Please, tell me what do you think about it. I would be grateful if you could give me any advice or solution.
Thank you so much for your time.
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RicardPalo
Hello Kris, I'm doing a project about a self guided robot car, so I use the MPU9250 as compass. I have followed your codes and calibration advices. The problem is that after calibrating the MPU9250 I obtain good results, but only on the point I've made the calibration. When I calibrate the sensor, the robot car is stopped and the yaw is good. But when the car moves to another position (because the car has to follow a path), sometimes the yaw gotten is really different than what it should be.
I suppose that it is happening because of another magnetic fields. When I move the car keeping it 1.5 metres away from the ground, the yaw remains good. Maybe there ara magnetic fields under the ground generated by wiring or something?
I'm a little lost, because I don't know what I can do. Maybe make the calibration in different points where I know the car will pass through, and then take the magbias averages?
Please, tell me what do you think about it. I would be grateful if you could give me any advice or solution.
Thank you so much for your time.