Description
This Micro SD Card Reader Module (TF Card Adapter) allows microcontrollers like Arduino, AVR, STM32, ESP32, and others to read and write data on MicroSD or MicroSDHC cards via the SPI interface. It’s an essential component for projects requiring data logging, file storage, or firmware updates through SD card access.
Designed for ease of integration, it includes on-board 3.3V voltage regulation and a level shifting circuit, making it compatible with both 3.3V and 5V logic levels. The onboard self-ejecting Micro SD card holder and standard 6-pin SPI interface make this module ready to plug and play with your embedded system or Arduino IDE.
✅ Key Features
Supports Micro SD and Micro SDHC cards (including high-speed cards)
Uses SPI interface for stable communication with microcontrollers
Compatible with 3.3V and 5V logic levels
On-board 3.3V LDO voltage regulator for safe MicroSD operation
️ Equipped with 4 mounting holes for secure placement using M2 screws
Compatible with Arduino’s SD library for quick coding and integration
Standard 6-pin interface: GND, VCC, MISO, MOSI, SCK, CS
Technical Specifications
| Parameter | Details |
|---|---|
| Input Voltage | 4.5V – 5.5V |
| Logic Level Support | 3.3V and 5V |
| Interface | SPI (MISO, MOSI, SCK, CS) |
| Voltage Regulator | Onboard LDO for 3.3V regulation |
| Card Compatibility | Micro SD (TF), Micro SDHC |
| Mounting | 4 M2 screw holes (Ø 2.2mm) |
| Dimensions | Approx. 42mm x 24mm (L x W) |
| Applications | Arduino, STM32, ESP8266, ESP32, Raspberry Pi, etc. |
Pinout (Control Interface)
| Pin | Description |
|---|---|
| GND | Ground |
| VCC | Power input (4.5V–5.5V) |
| MISO | SPI Master In Slave Out |
| MOSI | SPI Master Out Slave In |
| SCK | SPI Clock |
| CS | SPI Chip Select |
Applications
Data logging (temperature, GPS, sensor)
Audio/music file storage for playback
FAT file system testing and development
Bootloader or firmware update systems
Robotics or embedded project file storage
FAQ – Frequently Asked Questions
Q1: Is this compatible with Arduino Uno?
✅ Yes, fully compatible. Use the built-in SD library for quick integration.
Q2: Does it work with 3.3V systems like ESP8266 or STM32?
✅ Yes, the module includes logic level conversion and supports 3.3V logic.
Q3: Can I use SDXC cards with this module?
No, only Micro SD and Micro SDHC cards (up to 32GB) are supported.
Q4: What libraries can I use with Arduino IDE?
Use the standard <SD.h> library or SDFat for more advanced features.
Q5: How do I connect it to Arduino?
Connect VCC to 5V (or 3.3V), GND to GND, and SPI pins to their corresponding digital pins.
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