Micro SD Card Module SPI Reader for Arduino

This module puts a microSD card slot on an SPI bus, turning any Arduino-class board into something that can read and write real files - data logs that outlive a power cycle, configuration that survives a reset, or media assets too large to fit in onboard flash. An onboard AMS1117 regulator steps a 5V supply down to the 3.3V the SD card standard actually requires, so it works directly off a 5V Arduino without a separate level-shifting circuit.

Communication is standard SPI - MOSI, SCK, MISO and a chip-select pin - which most Arduino SD libraries already assume, so a project reads and writes files with well-documented library calls rather than raw SD protocol handling.

Common uses are data loggers recording sensor readings over time, projects that need to survive a power loss without losing data, and any build reading configuration or media files too large for the microcontroller's own flash memory.