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SPI Micro SD Card Reader Module with Level Shifter

SPI Micro SD Card Reader Module with Level Shifter

SpecificationDetails
InterfaceStandard SPI (MOSI, MISO, SCK, CS)
Input Voltage4.5V to 5.5V DC (Onboard 3.3V LDO)
Logic Level3.3V and 5V Compatible
Supported CardsMicro SD (≤2GB), Micro SDHC (≤32GB)
File SystemFAT16 / FAT32
DimensionsApprox. 42mm x 24mm
Mounting4 x M2 Positioning Holes
                                 Price

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Product Description

The Micro SD Card Adapter is engineered to bridge the gap between 5V microcontrollers and 3.3V SD cards. It features an onboard logic level shifter (often the 74LVC125A or similar) that safely translates 5V signals from an Arduino Uno to the 3.3V required by the SD card, preventing data corruption and hardware damage. The integrated 3.3V LDO regulator ensures that the SD card receives stable power even when the module is supplied with 5V. Its breadboard-friendly design makes it a favorite for rapid prototyping in environmental monitoring and autonomous vehicle logging.

Key Features

  • Universal Compatibility: Works seamlessly with both 3.3V (ESP32/STM32) and 5V (Arduino) logic systems without external components.

  • Mass Storage Support: Read/Write access to cards up to 32GB, allowing for massive data collection or media storage.

  • Onboard Level Shifting: Integrated IC protects sensitive SD card pins from high-voltage logic signals.

  • Standard SPI Protocol: Uses only 4 signal pins, leaving more I/O available for sensors and actuators.

  • Status LED: Some versions include an onboard LED to indicate power or communication activity.

Technical Details

  • Current Consumption: Typically 0.2mA (idle) to 200mA (peak write).

  • Communication Speed: Supports SPI frequencies up to 25MHz (dependent on card and MCU).

  • Pinout: GND, VCC, MISO, MOSI, SCK, CS.

Prototyping and Engineering Tips from Robogears

  • The "5V Pin" Rule: If you are using an Arduino Uno, always connect the module’s VCC to the 5V pin, not the 3.3V pin. The onboard regulator needs the higher voltage "headroom" to output a stable 3.3V for the SD card.

  • CS Pin Assignment: While SCK, MISO, and MOSI are hardware-fixed, the Chip Select (CS) pin can be moved to any digital pin. In your code, ensure SD.begin(CS_PIN) matches the actual wiring (Pin 4 is the common default).

  • Format Your Card: If the module fails to initialize, ensure your Micro SD card is formatted to FAT32 (for cards >2GB) or FAT16 (for cards ≤2GB). Use the official "SD Memory Card Formatter" tool for the best compatibility.

  • Power Stability: SD cards draw significant current spikes during write operations. If you experience intermittent "Card Failed" errors, add a 10uF to 100uF capacitor across the module's VCC and GND pins to smooth out power fluctuations.

Package Includes

  • 1 x Micro SD Card Reader Module (SPI Interface)

Disclaimer

SD cards natively operate at 3.3V. Using a module without a level shifter on a 5V Arduino will permanently damage the SD card. Always verify your module has the level-shifting IC before connecting to 5V logic.

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