I'd like to read data from a SD card using a microcontroller (through SPI protocol). Looking for a slot for the SD card, I saw two different boards.
This one has apparently a digital buffer and other components
This one on the other hand looks like is only a direct connection to the SD card pins.
Why is a digital buffer needed in case? I didn't really get in general what digital buffers are used for.
Alternatively, would the second board be enough?