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The module is a micro SD card read and write module;SCM system can read and write files in the SD card through SPI interface; Arduino users can initialize£¬ read and write the card by using SD card library of Arduino IDE with this module; You can also directly plug it onto the MB102 breadboard to DIY your project. Feature: - Compatibility: can be directly connected to Arduino board or Raspberry Pi£¬ 51£¬ AVR£¬ STM32 board. - Support card type: Micro SD ( <= 2G )£¬ Micro SDHC ( <= 32G ) - Operating voltage: 3.2V - 5.5V (Onboard 3.3v LDO Regulator) - Interface logic voltage: 3.3V / 5V compatible(Onboard level shift circuit) - Logic Interface Type: Standard SPI port. - Working mode: SPI mode. Applications: DIY projects with breadboard£¬ Storage module£¬ MP3 player memory.