Direction for the compass inside Ublox M8N Gps.

[saumik02]

which direction should i mount the GPS . What is the relation to the axis of mpu6050?

[saumik02]

The GPS has a inbuilt HMC5883l compass in it

[saumik02]

[kriswiner]

No idea about the M8N, best ask UBLOX

…

On Wed, Jun 19, 2024 at 1:10 PM saumik02 ***@***.***> wrote: image.png (view on web) <https://github.com/kriswiner/MPU6050/assets/169164356/181e1045-c04c-4f33-8a26-bdae6fa321fe> — Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKTYJURN3DHGTRSECCTZIHQSLAVCNFSM6AAAAABJST5DCGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNZZGM4TSMBQGQ> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[saumik02]

I have solved that issue. But I am getting the Euler angle. Is it right? Then what are the formulae for converting it to a direction vector? By the way, I am making a filter using UKF using your quaternion.

[saumik02]

I am using the NED frame as a reference. I am giving you some ss of my results. Please, guide me to the right path. From left yaw>pitch>roll.
When the X-axis is pointing north.

when the X-axis is pointing West.

when the X-axis is pointing South.

when the X-axis pointing east.

[kriswiner]

This is not looking correct to me. If the sensor is laying flat on a table, the pitch and roll shouldn't change as you rotate the sensor but the yaw or heading should change by ~90 degrees when the sensor is rotated by 90 degrees, etc. My guess is that the sensors (accel, gyro, and mag) are not properly calibrated.

…

On Tue, Jun 25, 2024 at 10:50 PM saumik02 ***@***.***> wrote: I am using the NED frame as a reference. I am giving you some ss of my results. Please, guide me to the right path. From left yaw>roll>pitch. When the X-axis is pointing north. image.png (view on web) <https://github.com/kriswiner/MPU6050/assets/169164356/5c58c400-dbcc-4862-89c5-949dc2bc766c> when the X-axis is pointing West. Screenshot.29.png (view on web) <https://github.com/kriswiner/MPU6050/assets/169164356/a58f611d-6f1b-481a-8360-d0d2a5eb42b0> when the X-axis is pointing South. Screenshot.30.png (view on web) <https://github.com/kriswiner/MPU6050/assets/169164356/1f2f39c8-e59b-48b6-bc55-31ffb7a66813> when the X-axis pointing east. Screenshot.31.png (view on web) <https://github.com/kriswiner/MPU6050/assets/169164356/99f04f4f-0c08-4b07-a9ca-e99f21348b4d> — Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKWG5AWN7742IRG4UIDZJJJDTAVCNFSM6AAAAABJST5DCGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCOJQG43DEOJSGA> . You are receiving this because you commented.Message ID: ***@***.***>

[saumik02]

Can I have a picture of your setup for this filter? It may be helpful for me to understand my sensor orientation is right or wrong.

[kriswiner]

I haven't used the MPU6050 for more than five years and I am not using the MAX M8N so I am not able to help you with a picture of my "setup". I would recommend you check the basic sensor output data. At rest and flat on a table, the accel should output 0, 0, 1000 milligs, the gyro should output 0, 0, 0 millidps, and the mag should output whatever is expected for your location (for me in California I expect 0.2, 0.1, and 0.4 Gauss), where the total magnetic field should be ~0.5 Gauss. You can look up what to expect for the local magnetic field using the government geological website or some such. Errors on these should be ~1% or less Anyway, until you can get these basic sensor results, the fusion filter and Euler angles are irrelevant.

…

On Wed, Jun 26, 2024 at 9:53 AM saumik02 ***@***.***> wrote: Can I have a picture of your setup for this filter? It may be helpful for me to understand my sensor orientation is right or wrong. — Reply to this email directly, view it on GitHub <#58 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKWRQMQ6ONVRCCQRCWLZJLWYPAVCNFSM6AAAAABJST5DCGVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCOJSGE4TQNRWGI> . You are receiving this because you commented.Message ID: ***@***.***>