Why data logging matters in Arduino - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start serial communication for data logging.

Arduino

void setup() {
  Serial.begin([1]);
}

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

A19200

B115200

C4800

D9600

Attempts:

3 left

💡 Hint

Common Mistakes

Using a baud rate too slow for efficient data logging.

115200 is a common baud rate for fast and reliable serial communication in Arduino data logging.

2fill in blank

medium

Complete the code to write sensor data to the serial monitor.

Arduino

void loop() {
  int sensorValue = analogRead(A0);
  Serial.[1](sensorValue);
  delay(1000);
}

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Aprintln

Bprint

Cwrite

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using Serial.print without new lines, causing cluttered output.

Serial.println sends data followed by a new line, making logs easier to read line by line.

3fill in blank

hard

Fix the error in the code to correctly open the SD card for logging.

Arduino

#include <SD.h>
const int chipSelect = 10;

void setup() {
  if (!SD.[1](chipSelect)) {
    Serial.println("SD card failed or not present");
    return;
  }
  Serial.println("SD card initialized.");
}

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Abegin

Bopen

Cstart

Dinit

Attempts:

3 left

💡 Hint

Common Mistakes

Using open() or init() which are not valid SD library methods.

SD.begin() initializes the SD card and must be called with the chip select pin.

4fill in blank

hard

Fill both blanks to write data to a file on the SD card.

Arduino

File dataFile = SD.[1]("log.txt", [2]);
if (dataFile) {
  dataFile.println("Sensor data");
  dataFile.close();
}

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Aopen

BFILE_WRITE

Cread

DFILE_READ

Attempts:

3 left

💡 Hint

Common Mistakes

Using FILE_READ when trying to write data.

Use SD.open() with FILE_WRITE to open a file for writing data.

5fill in blank

hard

Fill all three blanks to create a dictionary-like structure for logged data.

Arduino

struct DataEntry {
  int [1];
  float [2];
  char [3][20];
};

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Aid

Btemperature

Ctimestamp

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong data types or confusing variable names.

This struct holds an integer id, a float temperature, and a char array timestamp for logging.