SCK (Serial Clock) pin accepts clock pulses which synchronize data transmission generated by Arduino. MOSI (Master Out Slave In) is SPI input to the Micro SD Card Module. MISO (Master In Slave Out) is SPI output from the Micro SD Card Module. GND should be connected to the ground of Arduino. VCC pin supplies power for the module and should be connected to 5V pin on the Arduino. The micro SD card module is fairly simple to connect. Instead, every SD card module is based on ‘lower speed & less overhead’ SPI mode that is easy for any microcontroller to use. For that reason, hobbyist like us will likely never encounter SDIO mode interface code. But it is more complex and requires signing non-disclosure documents. SDIO mode is way faster and is used in mobile phones, digital cameras etc. There are actually two ways to interface with micro SD cards – SPI mode and SDIO mode. That means you can use this board to interact with both 3.3V and 5V microcontrollers like Arduino.
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