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MicroSD Card Breakout Board+ — Read and Write Files from Any MCU

The Adafruit MicroSD Card Breakout Board+ lets your Arduino, ESP32, or other microcontroller read and write files on a standard microSD card via SPI. Essential for data logging, audio playback, image storage, and any project that needs non-volatile file storage beyond what onboard flash provides.

Why you'll love it

  • 3V and 5V compatible: Onboard level shifting and regulator
  • Standard SPI: Works with Arduino SD library out of the box
  • Card detect pin: Know when a card is inserted
  • Compact: Small breakout fits in tight builds

Technical specifications

Card type MicroSD / MicroSDHC
Interface SPI
Logic level 3V and 5V (onboard shifting)
Supply 3.3–5V (onboard regulator)
Card detect Yes (active-low pin)

Build with this board

// from learn.circuit.rocks

Notes from the bench

// from blog.circuit.rocks

Ask the community

// from forum.circuit.rocks