Adafruit microsd card breakout board adafruit 254 p the adafruit microsd card breakout board will let your next project store up to 2gbytes of data using just 4 x pins on your microcontroller its onboard 5v to 3v regulator means it can supply up to 150ma to demanding sd cards the board is 3 or 5v compatible and the level shifting has been done with a chip which makes it more reliable and allows faster read write access adafruit have a href https learn adafruit com adafruit micro sd br