💾 Micro SD Card Adapter v1.1 Module for Arduino

SPI Interface | 3.3V Logic | Data Logging & Storage Module

📌 Overview

The Micro SD Card Adapter v1.1 Module is a compact storage interface module that allows Arduino and other microcontrollers to read from and write to a Micro SD card.

It is widely used in:

• Data logging projects

• IoT systems

• Sensor data storage

• Audio file storage

• Embedded system applications

The module communicates via SPI (Serial Peripheral Interface).

🔌 Interface Type

✔ SPI Communication
✔ Compatible with Arduino UNO, Nano, Mega
✔ Works with ESP8266 / ESP32 / STM32

📐 Technical Specifications

🔌 Pin Configuration

Most v1.1 modules have 6 pins:

⚠ Important: This module operates at 3.3V logic level.

Some versions include:

• Onboard 3.3V voltage regulator

• Level shifting circuit

🧠 Working Principle

1. Microcontroller communicates via SPI protocol.

2. Data is sent to or read from the Micro SD card.

3. Files can be created, read, modified, or deleted.

4. Stored data remains saved even after power off.

💡 Onboard Components

✔ Micro SD card slot
✔ 3.3V voltage regulator (AMS1117 in many versions)
✔ SPI interface pins
✔ Indicator LED (some versions)
✔ Mounting holes

📦 Supported Functions

• Create files

• Write sensor data

• Read stored files

• Store images or audio

• Log timestamps

• Data backup

🎯 Advantages

✔ Easy Arduino integration
✔ Reliable data storage
✔ Compact size
✔ Low power consumption
✔ Supports large capacity SD cards
✔ Ideal for data logging

📏 Physical Specifications

• PCB Color: Blue

• Compact rectangular board

• Standard 2.54mm header pins

• Mounting holes for stability

📦 Applications

• Data logger projects

• Weather stations

• GPS data storage

• IoT systems

• Security logging systems

• Audio playback systems

• Embedded industrial systems

🆚 EEPROM vs Micro SD

🧑‍💻 Example Arduino Code