Sorry to have given up so long.
Months ago we discussed of an issue I got with a GPS and GY-521 installation : freezing of the MPU-6050 during setup.
I rebuild a new project with a new Arduino mini-pro and one GY-521 alone.
And get ..... the same issue !
I check all three or more times without success.openXsensor starting..
FRSky Output Module: TX Pin=4
Sport protocol= 1
I download a fresh sketch and decide to proceed step by step.
In oXs_config_basic.h :
The MPU-6050 setup freeze when #define FIRST_BARO_SENSOR_USE MS5611 is set to NO_BARO
FIRST_BARO_SENSOR_USE is used to define the variable VARIO if its value is not NO_BARO.
But I don't find a link between VARIO and the IMU set up.
It seems that I did not get this issue whith the GPS alone and NO_BARO ...
Thank you for helping.