tone() function for frequency generation in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the tone() function do in Arduino?

The tone() function generates a square wave of a specified frequency on a pin, which can be used to play sounds like beeps or tones.

beginner

What are the basic parameters of the tone() function?

The basic parameters are: pin (the output pin), frequency (in Hertz), and optionally duration (how long to play the tone in milliseconds).

beginner

How do you stop a tone generated by tone()?

Use the noTone(pin) function to stop the tone on the specified pin.

intermediate

Can tone() play multiple tones on different pins at the same time?

No, Arduino can only generate one tone at a time. Calling tone() on a new pin stops the previous tone.

beginner

Write a simple Arduino code snippet to play a 440 Hz tone for 1 second on pin 8.

void setup() { tone(8, 440, 1000); // Play 440 Hz tone on pin 8 for 1000 ms } void loop() { // Nothing here }

What does the tone() function generate on an Arduino pin?

A A PWM signal with variable duty cycle

B A square wave of a specific frequency

C A constant voltage

D An analog voltage

The tone() function generates a square wave at the frequency you specify.

Which parameter is NOT part of the tone() function?

A Volume level

B Frequency in Hertz

C Duration in milliseconds

D Pin number

The tone() function does not control volume; it only controls frequency and duration.

How do you stop a tone playing on a pin?

A Call <code>noTone(pin)</code>

B Call <code>stopTone(pin)</code>

C Call <code>tone(pin, 0)</code>

D Disconnect the pin

The noTone(pin) function stops the tone on the specified pin.

What happens if you call tone() on a new pin while a tone is already playing?

A Both tones play simultaneously

B Arduino crashes

C The new tone is ignored

D The new tone replaces the old one

Arduino can only play one tone at a time; the new call stops the previous tone.

Which frequency corresponds to the musical note A4, often used in tone examples?

A 220 Hz

B 330 Hz

C 440 Hz

D 880 Hz

440 Hz is the standard frequency for the musical note A4.

Explain how to use the tone() function to generate a sound on an Arduino pin.

Think about what parameters you need and how to stop the sound.

Describe the limitations of the tone() function when playing multiple sounds.

Consider what happens if you try to play two tones at once.