#include <SD.h>

// Pin numbers for the SD card module
#define SD_CS_PIN 5   // CS pin for SD card module

// File name for testing
#define FILE_NAME "/test.txt"  // File path should start with "/"

// Dummy data to be written
#define DUMMY_DATA "This is dummy data for testing."

void setup() {
  Serial.begin(9600);
  
  // Initialize SD card
  if (!SD.begin(SD_CS_PIN)) {
    Serial.println("Initialization failed!");
    return;
  }
  
  Serial.println("Initialization done.");
  
  // Call the function to write dummy data to SD card
  writeDummyData();
}

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

void writeDummyData() {
  // Open the file in write mode
  File file = SD.open(FILE_NAME, FILE_WRITE);
  
  // Check if the file opened successfully
  if (file) {
    // Write dummy data to the file
    file.println(DUMMY_DATA);
    Serial.println("Dummy data written to SD card.");
    
    // Close the file
    file.close();
  } else {
    // If the file failed to open, print an error message
    Serial.println("Error opening file.");
  }
}