MicroSD Shield and SD Breakout Hookup Guide

Contributors: a_cavis
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SD Card Breakout Boards

If you have a smaller Arduino (or you'd like to put a full-size SD card in your project), you can use the SparkFun microSD Transflash Breakout or the SparkFun SD/MMC Card Breakout with the SD card library.

Since these smaller breakouts don't have built-in level shifting, make sure you have a logic level shifter like the SparkFun Logic Level Converter in the circuit, or use a 3.3V Arduino like the SparkFun Pro Mini 3.3V/8Mhz

Both examples use Pin 8 as the chip select line, just like the shield example above.

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You can use either breakout with a 3.3V Arduino.

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Use a level shifter between the card breakout and your 5V Arduino.