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.

1. https://www.adafruit.com/product/254

This one has apparently a digital buffer and other components

2. https://www.ebay.it/itm/Micro-SD-TF-Card-Breakout-to-DIP-Board-Module-for-Arduino-1573Z/163459088257?hash=item260eebbf81:g:VUIAAOSwsY1c9DJV

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?

Thanks in advance,

Alberto

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.

1. https://www.adafruit.com/product/254

This one has apparently a digital buffer and other components

2. https://www.ebay.it/itm/Micro-SD-TF-Card-Breakout-to-DIP-Board-Module-for-Arduino-1573Z/163459088257?hash=item260eebbf81:g:VUIAAOSwsY1c9DJV

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?