MPU9250, what is switch in fusiontest.py

[fanlessfan]

Hi @peterhinch

when I try to run the fusion test.py for MPU9250, there is code for external switch. Could you explain what that is and how to define it? I am using ESP32 board.

thx

[peterhinch]

See this line. It allows for a physical switch or pushbutton connected between a pin and Gnd. This enables you to tell the program when calibration is done. However the purpose of calibration is to correct the magnetometer, and your device doesn't have one.

[fanlessfan]

Hi @peterhinch , I did see that line. Could you explain more about the calibration process? I do have MPU9250 try.

thx

[peterhinch]

Please read the docs. If there is a specific point in the docs which you don't understand, please point me to the paragraph which is unclear. That way I can improve the docs for others.