Why sound output is useful in Arduino - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to play a sound using the buzzer.

Arduino

tone(8, [1]);

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

ApinMode

BdigitalWrite

Cdelay

D440

Attempts:

3 left

💡 Hint

Common Mistakes

Using a function name instead of a frequency number.

The tone() function needs a frequency value to play a sound. 440 Hz is the frequency for the note A.

2fill in blank

medium

Complete the code to stop the sound from the buzzer.

Arduino

noTone([1]);

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

A9

B7

C8

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using a pin number different from the buzzer's pin.

The buzzer is connected to pin 8, so noTone(8); stops the sound on that pin.

3fill in blank

hard

Fix the error in the code to play a 1-second beep.

Arduino

tone(8, 1000);
delay([1]);
noTone(8);

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

A100

B1000

C10

D5000

Attempts:

3 left

💡 Hint

Common Mistakes

Using delay less than 1000 causes a shorter beep.

The delay should be 1000 milliseconds to play the beep for 1 second.

4fill in blank

hard

Fill both blanks to create a dictionary of notes and their frequencies.

Arduino

int notes[] = [1];
int frequencies[] = [2];

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

A{262, 294, 330, 349}

B[262, 294, 330, 349]

C{440, 494, 523, 587}

D[440, 494, 523, 587]

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets which are not valid for array initialization in Arduino C++.

In Arduino C++, arrays use curly braces {} to list values. The first array is notes, the second is frequencies.

5fill in blank

hard

Fill all three blanks to play each note for 500 milliseconds.

Arduino

for (int i = 0; i < [1]; i++) {
  tone(8, [2][i]);
  delay([3]);
  noTone(8);
}

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

A4

Bfrequencies

C500

Dnotes

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong array name or wrong loop count.

The loop runs 4 times for 4 notes. The frequencies array holds the sound frequencies. Delay is 500 ms for each note.