Datasheet

4
6 pins (GND, VCC, MISO, MOSI, SCK, CS), GND is the ground, VCC is the
power supply, MISO, MOSI, SCK are the SPI bus, and CS is the chip select
signal pin;
3.3V Regulator circuit：
The 3.3V output by the LDO voltage regulator supplies power for the level
conversion chip and Micro SD card;
Level conversion circuit:
Signals to the Micro SD card converts into 3.3V, and MISO signal from Micro SD
card to control ports also is changed into 3.3V. Typically, the AVR microcontroller
system can read this signal.
Micro SD card holder: It is a self-elastic card holder, which is convenient for
card insertion and removal.
Positioning holes: 4 M2 screw positioning holes with a diameter of 2.2mm,
easy to install and realize the combination between modules;
How to use
Arduino compatible board: Catduino *1（Atmega328P microcontroller
development board）and a mini USB cable；
Micro SD card module *1；
Samsung 2G Micro SD card*1；