Writing data to SD card in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What library do you need to include to write data to an SD card in Arduino?

You need to include the SD.h library, which provides functions to read and write files on an SD card.

beginner

How do you initialize the SD card in your Arduino sketch?

Use SD.begin(chipSelectPin) where chipSelectPin is the pin connected to the SD card's chip select line. It returns true if the card is ready.

beginner

What Arduino function opens a file for writing on the SD card?

Use SD.open(filename, FILE_WRITE) to open or create a file for writing data.

beginner

How do you write a line of text to a file on the SD card?

Use file.println(data) to write the data followed by a new line to the file.

beginner

Why is it important to close the file after writing data to the SD card?

Closing the file with file.close() ensures all data is saved properly and frees up resources for other operations.

Which Arduino library is used to write data to an SD card?

A SD.h

B Wire.h

C SPI.h

D EEPROM.h

The SD.h library is specifically designed for SD card file operations.

What does SD.begin(chipSelectPin) do?

A Formats the SD card

B Writes data to the SD card

C Closes the file on the SD card

D Initializes the SD card and SPI communication

It sets up communication with the SD card and prepares it for reading or writing.

How do you open a file for writing on the SD card?

A SD.open(filename, FILE_WRITE)

B SD.read(filename)

C SD.close(filename)

D SD.format(filename)

Use SD.open with FILE_WRITE mode to write data.

Which function writes a line of text to an open file on the SD card?

A file.read()

B file.open()

C file.println(data)

D file.close()

file.println() writes data followed by a new line.

Why should you call file.close() after writing data?

A To delete the file

B To save data and free resources

C To open the file again

D To format the SD card

Closing the file saves all data and releases the file for other uses.

Explain the steps to write a text line to an SD card using Arduino.

Think about setup, opening, writing, and closing.

Why is it important to check if SD.begin() returns true before writing data?

Consider what happens if the card is not ready.