The level conversion circuit board that can interface level is 5V or 3.3V
Communication interface is a standard SPI interface
Control Interface: A total of six pins (GND, VCC, MISO, MOSI, SCK, CS), GND to ground,
VCC is the power supply, MISO, MOSI, SCK is the SPI bus, CS is the chip select signal pin;
3.3V regulator circuit: LDO regulator output 3.3V as level converter chip, Micro SD card supply;
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