Description

The Micro SD Card Reader Module is a compact breakout board designed for embedded storage and data logging projects. MicroSD cards operate natively at 3.3V logic levels; this module includes built-in signal level conversion (using a 74LVC125A or resistor network) alongside a 3.3V LDO voltage regulator. This allows direct, safe wiring to 5V development boards (such as Arduino Uno, Mega, and Nano) as well as 3.3V platforms (ESP32, ESP8266, STM32, Raspberry Pi Pico) without risking memory card damage.

Communicating over the standard 4-wire Serial Peripheral Interface (SPI), it allows developers to log sensor telemetry data to CSV/text files, read audio samples for wave player projects, store configuration files, or host web assets for standalone Wi-Fi servers.

Technical Specifications

Pinout Description

• GND: Power supply ground connection.

• VCC: 5V DC power supply input.

• MISO (Master In Slave Out): SPI data output line from SD card to microcontroller.

• MOSI (Master Out Slave In): SPI data input line from microcontroller to SD card.

• SCK (Serial Clock): Clock signal output from microcontroller.

• CS (Chip Select): Active LOW control pin to select the SPI slave device.

Basic Arduino Wiring & Example Code

Wiring Diagram

• VCC ➔ Arduino 5V

• GND ➔ Arduino GND

• CS ➔ Arduino Digital Pin 10

• MOSI ➔ Arduino Digital Pin 11

• MISO ➔ Arduino Digital Pin 12

• SCK ➔ Arduino Digital Pin 13

#include <SPI.h>
#include <SD.h>

const int chipSelect = 10;

void setup() {
  Serial.begin(9600);
  while (!Serial);

  Serial.print("Initializing SD card...");
  if (!SD.begin(chipSelect)) {
    Serial.println("Initialization failed! Check wiring or card format (FAT32).");
    return;
  }
  Serial.println("Card initialized successfully.");

  // Append data to log file
  File logFile = SD.open("datalog.txt", FILE_WRITE);
  if (logFile) {
    logFile.println("System initialized. Logging started...");
    logFile.close();
    Serial.println("Data logged successfully.");
  } else {
    Serial.println("Error opening datalog.txt");
  }
}

void loop() {
  // Main application logic
}

Key Features & Highlights

• Integrated Level Shifter: Onboard level conversion protects delicate SD card flash memory from 5V microcontroller logic signals.

• Onboard Power Regulation: Operates reliably from standard 5V rails while delivering regulated 3.3V power to the card.

• Standard 0.1″ (2.54mm) Pitch Headers: Breadboard and jumper cable friendly for easy prototyping.

• Self-Locking Card Socket: Features a push-push pop-out MicroSD slot for convenient card insertion and removal.

Common Applications

• Environmental sensor data loggers (temperature, humidity, GPS tracking).

• Audio playback players (WAV file decoding with microcontrollers).

• Configuration storage for robotics, IoT devices, and web servers.

• Flight data recorders for drones and high-altitude balloons.

What’s Included in the Box

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

Why Buy From Aryabot?

• 100% Quality Hardware: Sourced through trusted supply channels to ensure reliable SPI signal timing and sturdy card retention springs.

• Tested & Benchmarked: Quality-checked for pin continuity, LDO voltage output, and SPI read/write responses prior to dispatch.

• GST Invoice Provided: Tax-compliant B2B invoices generated for commercial deployments, institutional research labs, and academic orders.

• Pan-India Express Dispatch: Fast order processing and direct shipping from our Noida fulfillment warehouse.