Set up the swtich to the Card Slot you want

  • left side for left side big SD card Slot
  • right side for micro SD card slot


  • For default arduino official SD library, only need to change CS pin to 10. NOT default D4 in sketch.
  • Notice switch to “big” or “Micro” for either SD card or microSD card.
  • Supported by default Arduino IDE SD library.
  • See the manual documents, library available on this page.