BMM350 offset at low temperatures

n-ito2222 · August 21, 2025, 8:54am

Hi.

I observed that BMM350 mag value is offset at low temperatures.

When I deleted the following source code and run it, and the offset stopped.


      
          if (temp > 0.0f) {
              temp -= 25.49f;
          } else if (temp < 0.0f) {
              temp += 25.49f;
          }

I don’t think this code is necessary, what do you think?

Thank you for your cooperation.

n-ito2222 · October 17, 2025, 2:58am

I got DataFlashLog in a low temperature environment.

Mag0 is IST8310.
Mag1 is BMM350.

Thank you for your cooperation.

cuav-chen2 · October 17, 2025, 7:12am

Thanks for the info. We have reproduced the issue and created a PR to fix it.

n-ito2222 · October 20, 2025, 5:09am

Thanks.

I could get data without the offset using PR #31302.

Thank you very much.