Writing data to SD card in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the SD card.

Arduino

#include <SD.h>
const int chipSelect = 4;

void setup() {
  Serial.begin(9600);
  if (!SD.[1](chipSelect)) {
    Serial.println("Initialization failed!");
    return;
  }
  Serial.println("Initialization done.");
}

void loop() {}

Drag options to blanks, or click blank then click option'

Abegin

Binit

Cstart

Dopen

Attempts:

3 left

💡 Hint

Common Mistakes

Using SD.init() instead of SD.begin()

Forgetting to pass the chip select pin

Calling the function outside setup()

The SD library uses SD.begin() to initialize the card with the chip select pin.

2fill in blank

medium

Complete the code to open a file named "data.txt" for writing.

Arduino

File dataFile = SD.[1]("data.txt", FILE_WRITE);

Drag options to blanks, or click blank then click option'

Awrite

Bcreate

Cread

Dopen

Attempts:

3 left

💡 Hint

Common Mistakes

Using SD.read() which is for reading files

Using SD.write() which is for writing data to files, not opening

Using SD.create() which does not exist

The SD library uses SD.open() to open files. FILE_WRITE mode opens the file for writing.

3fill in blank

hard

Fix the error in the code to write "Hello" to the file.

Arduino

if (dataFile) {
  dataFile.[1]("Hello");
  dataFile.close();
} else {
  Serial.println("Error opening file");
}

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Aopen

Bprint

Cwrite

Dprintln

Attempts:

3 left

💡 Hint

Common Mistakes

Using write() which writes bytes, not strings

Using println() which adds a newline

Using open() which is for opening files

The File object uses print() to write text data to the file.

4fill in blank

hard

Fill both blanks to write a number and close the file properly.

Arduino

File dataFile = SD.open("numbers.txt", FILE_WRITE);
if (dataFile) {
  dataFile.[1](123);
  dataFile.[2]();
} else {
  Serial.println("Failed to open file");
}

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Aprint

Bclose

Cwrite

Dflush

Attempts:

3 left

💡 Hint

Common Mistakes

Using print() for numbers without conversion

Forgetting to close the file

Using flush() instead of close()

Use write() to write the number as bytes and close() to close the file.

5fill in blank

hard

Fill all three blanks to write multiple lines and close the file.

Arduino

File dataFile = SD.open("log.txt", FILE_WRITE);
if (dataFile) {
  dataFile.[1]("Line 1");
  dataFile.[2]("Line 2");
  dataFile.[3]();
} else {
  Serial.println("Cannot open file");
}

Drag options to blanks, or click blank then click option'

Aprint

Bprintln

Cclose

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using print() without newlines

Using write() which writes bytes

Forgetting to close the file

Use println() to write lines with newlines and close() to close the file.