Can't mount microSD card with Freenove ESP32 WROVER Module and Sparfun MicroSD module

Question

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?

• jsotola: please do not post a link to code ... add the code text to your post ... use the edit button ... no pictures please

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:
https://randomnerdtutorials.com/esp32-spi-communication-arduino/