Receiving commands over Bluetooth in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the Bluetooth serial communication at 9600 baud.

Arduino

Serial[1](9600);

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

Aread

Bbegin

Cprint

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of begin to start communication.

Trying to read or write before starting communication.

The begin function starts serial communication at the specified baud rate.

2fill in blank

medium

Complete the code to check if data is available to read from Bluetooth.

Arduino

if (Serial.[1]() > 0) {

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

Aavailable

Bread

Cwrite

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using read() instead of available() to check for data.

Using write() or begin() which do not check data availability.

The available() function returns the number of bytes available to read.

3fill in blank

hard

Fix the error in reading a byte from Bluetooth and storing it in variable command.

Arduino

char command = Serial.[1]();

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

Aavailable

Bwrite

Cbegin

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using available() which returns number of bytes, not the data.

Using write() which sends data, not reads it.

The read() function reads one byte from the serial buffer.

4fill in blank

hard

Fill both blanks to read a command and check if it equals 'A'.

Arduino

if (Serial.[1]() > 0) {
  char command = Serial.[2]();
  if (command == 'A') {
    // Do something
  }
}

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

Aavailable

Bread

Cwrite

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Reading without checking if data is available.

Using write() or begin() instead of read() to get data.

First, check if data is available with available(), then read it with read().

5fill in blank

hard

Fill all three blanks to read a command, check if it is 'B', and send a response 'OK'.

Arduino

if (Serial.[1]() > 0) {
  char command = Serial.[2]();
  if (command == '[3]') {
    Serial.println("OK");
  }
}

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

Aavailable

Bread

CB

DA

Attempts:

3 left

💡 Hint

Common Mistakes

Not checking availability before reading.

Comparing to a string instead of a character.

Using wrong functions to read or check data.

Check if data is available, read it, then compare to character 'B'. If true, send "OK".