Supports Micro SD card,Micro SDHC card (high-speed card).

The communication interface is the standard SPI interface.
Can interface level conversion boards with levels of 5V and 3.3V.

Control interface:GND, VCC, MISO, MOSI, SCK, CS

VCC:power supply;
CS:chip selection signal pin;
MISO, MOSI, SCK:SPI bus;

Level conversion circuit:
Signal in the direction of the Micro-SD card is converted to 3.3V;
MISO signal in the control interface of the direction of the Micro-SD card is converted to 3.3V;
Can be read by the general AVR single-chip microcomputer system;