Hi Koe,
bme68x_demo_sample.ino is the same example code for our AI studio.
Using bme68x_demo_sample.ino, you could save the raw data and use and train the data using AI studio.
So, once you train your own config file using AI studio, you have to use examples in x8_board_examples.
We don't have other examples for SD card itself, but I think you can find some example code some online, currently we are using SdFat library.
Please let me know if you have further qeustions.
Thank you.
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