Type: 2pcs Micro SD TF Card Shield Expansion Board, Support Micro SD Card, Micro SDHC card (high-speed card).. The module (MicroSD Card Adapter) is a Micro SD card reader module, and the SPI interface via the file system driver, microcontroller system to complete the MicroSD card read and write files..
SPI Interface: A total of 6pins (GND, VCC, MISO, MOSI, SCK, CS), GND toground, VCC is the power supply, MISO, MOSI, SCK is the SPI bus, CS is the chip select signal pin.. On-board level conversion circuit, that means the interface level is 5V or 3.3V.. Power supply is 4.5V - 5.5V, Onboard 3.3V voltage stabilizing circuit.