Micro SD Card

Pin Configuration

• 3V3: Power supply for the module (3.3V).
• D1 : data pin, used for data transfer
• SCK: Clock single for SPI communication
• MO : Master out slave in
• MI : Master in Slave out
• CS : chip select
• GND : ground
• D2 : data pin, used for data transfer

Key Features

• Supports microSD Cards
• SPI & SDIO Interface Compatible
• Plug-and-Play Interface
• Compact and Lightweight Design
• File System Compatibility
• Low Power Consumption
• Push-push type socket

Application

• Data Logging: Storing sensor data, logs, or measurements in projects like weather monitoring or IoT.
• Media Storage: Saving and retrieving images, videos, or audio files.
• Boot Media: Used in systems like Raspberry Pi for storing operating systems.
• Portable Data Transfer: Enabling easy data transport between devices.

Step 1: Hardware Required

1. Glyph Boards
2. G-MOD Micro SDCard Module

Step 2: Circuit Diagram

Step 3: Code Setup

1. Open Arduino IDE.
2. Copy and paste the following code into the Arduino IDE:

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

#define SD_CS 17 // Change this to match your Glyph board's SD card CS pin
//GMOD-- GLYPH
//3v3-- 3v3
//sck-- sck
//MO -- MO
//MI-- MI
//GND-- GND

void listFiles(File dir, int numTabs = 0) {
    while (true) {
        File entry = dir.openNextFile();
        if (!entry) {
            break; // No more files
        }
        for (int i = 0; i < numTabs; i++) {
            Serial.print("\t");
        }
        Serial.print(entry.name());
        if (entry.isDirectory()) {
            Serial.println("/");
            listFiles(entry, numTabs + 1); // Recursively list directories
        } else {
            Serial.print("\t");
            Serial.println(entry.size(), DEC);
        }
        entry.close();
    }
}

void setup() {
    Serial.begin(115200);
    while (!Serial);
    
    Serial.println("Initializing SD card...");
    
    if (!SD.begin(SD_CS)) {
        Serial.println("SD card not detected!");
        return;
    }
    
    Serial.println("SD card detected successfully!");
    
    // Print card information
    uint32_t cardSize = SD.cardSize() / (1024 * 1024);
    Serial.print("Card Size: ");
    Serial.print(cardSize);
    Serial.println(" MB");
    
    // List files on SD card
    File root = SD.open("/");
    listFiles(root);
    root.close();
}

void loop() {
    // Nothing to do in the loop
}

Step 4: Upload the Code

1. Connect the Board

• Connect your GLYPH board to your computer

2. Select the Board and Port

• Tools > Board > esp32 > Pcbcupid GLYPH C3

• Tools > Port and select the port connected to your GLYPH.
• Tools > USB CDC on Boot > Enabled

3. Upload the Code
   • Click the upload button (➡️ icon) or use the shortcut CRTL + U in Arduino IDE to upload the code to the board.

Step 5: Observe Output on Serial Monitor