I'm using Freenove's ESP32 WROVER Module with their GPIO expansion board as shown in the image below:

Circuit image

I'm trying to integrate Sparkfun's microSD module in the circuit. Here's my sketch. However, I'm unable to mount the card despite it works fine using an ESP32-CAM board with integrated SD card reader.

Any clues on what I'm doing wrong?

  • please do not post a link to code ... add the code text to your post ... use the edit button ... no pictures please
    – jsotola
    Jun 1, 2023 at 2:23

1 Answer 1


Your pinout to the SD is unclear from the picture, but I can see that you are using pin 15, which is the MTDO strapping pin- which will cause issues for sure.
enter image description here

You can learn more here about using alternative pins here:

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