#include <SD.h>

const int chipSelect = 10; // Set the chip select pin for your SD card module

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ; // Wait for serial port to connect
  }

  Serial.print("Initializing SD card...");

  if (!SD.begin(chipSelect)) {
    Serial.println("SD card initialization failed.");
    return;
  }
  Serial.println("SD card initialized successfully.");
}

void loop() {
  File dataFile = SD.open("wokwi.txt", FILE_WRITE); // Open the file "data.txt" on the SD card for writing
  
  if (dataFile) {
    dataFile.println("Hello, world!"); // Write data to the file
    dataFile.close(); // Close the file
    Serial.println("Data written to SD card.");
  }
  else {
    Serial.println("Error opening file.");
  }

  delay(1000); // Wait for 1 second before writing again

  File dataFile2 = SD.open("wokwi.txt", FILE_READ); // Open the file "data.txt" on the SD card for reading
  
  if (dataFile2) {
    while (dataFile2.available()) { // Read the data from the file
      Serial.write(dataFile2.read());
    }
    dataFile2.close(); // Close the file
  }
  else {
    Serial.println("Error opening file.");
  }
}