CSV format data logging in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open the file for writing in CSV format.

Arduino

File dataFile = SD.open([1], FILE_WRITE);

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

A"data.txt"

B"data.csv"

C"log.csv"

D"log.txt"

Attempts:

3 left

💡 Hint

Common Mistakes

Using .txt extension instead of .csv

Forgetting quotes around file name

We open the file named data.csv to write CSV data.

2fill in blank

medium

Complete the code to write a comma separator between values in CSV.

Arduino

dataFile.print(sensorValue); dataFile.print([1]); dataFile.println(temperature);

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

A" "

B";"

C","

D"\n"

Attempts:

3 left

💡 Hint

Common Mistakes

Using semicolon instead of comma

Using newline instead of comma

CSV uses commas to separate values, so we print a comma between values.

3fill in blank

hard

Fix the error in the code to close the file after writing data.

Arduino

dataFile.[1]();

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

Astop

Bflush

Cend

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using flush instead of close

Using end or stop which do not exist

We must close the file with close() to save data properly.

4fill in blank

hard

Fill both blanks to write a CSV header line with columns 'Time' and 'Value'.

Arduino

dataFile.print([1]); dataFile.print([2]); dataFile.println();

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

A"Time,"

B"Value"

C"Value,"

D"Time"

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping column order

Missing comma after first column

The header line should be Time,Value with a comma separating columns.

5fill in blank

hard

Fill all three blanks to write sensor data with timestamp in CSV format.

Arduino

dataFile.print([1]); dataFile.print([2]); dataFile.println([3]);

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

Amillis()

B","

CsensorValue

DanalogRead(A0)

Attempts:

3 left

💡 Hint

Common Mistakes

Using analogRead directly instead of sensorValue variable

Missing comma separator

We write the current time from millis(), then a comma, then the sensor value.