The nice thing about the Arduino Nano 33 BLE, besides the Bluetooth, is that it has an IMU on board. We can use it as a human-machine interface for the AR glasses. To do this, the Arduino_LSM9DS1 library needs to be installed. An example code for the accelerometer is shown here. The accelerometer can also be used to go into power save mode when no movement is detected for a certain time, for example during charging. In addition, a warning can be issued if one takes critical positions while wearing the mask.
The U8x8 library works without problems with the Arduino Nano 33 BLE. An unnamed I2C 128x64 OLED was used for testing.
Adafruit SGP30 lib
Also the Adafruit SGP30 library works without any issues with the Arduino Nano 33 BLE.