Scanning all GPIOs for CS pins

The provided code tests all GPIOs as CS pins. A response different from 0xFF likely means you've found the correct CS pin. Some sensors require specific register reads (WHO_AM_I) to respond. If no response: Try different SPI modes ( SPI_MODE0 , SPI_MODE1 , etc.). Verify power connections. Use a logic analyzer to check SPI activity. #include <SPI.h> // Define SPI bus (adjust to match your sensor's…