Outdated Readme

[Hasi123]

Hi, please update the readme file. There is no documentation on how to calibrate the magnetometer without an SD card. I tried to update my simple vario with the BMP280/MPU9250 with your latest updates, but it didn't work.

Does the magnetometer make any real-world difference?

[prunkdump]

Hi !

You're right ! But as the magnetometer is not really used actually, I don't have taken the time to update the README.

The target feature is wind speed/direction detection.

To use the calibratiion sketch move the variometer in many directions. Each time you have a new direction you have a beep. When there is to much time without new direction recorded the variometer make three beeps signaling that the calibration is done.

I keep your issue.