Tone() is used to generate a square wave of the specified frequency (and 50% duty cycle) on a pin. A duration can be specified, otherwise the wave continues until a call to
In this project, use this two functions to make the passive buzzer vibrate to make sound. Like the active buzzer, the passive buzzer also uses the phenomenon of electromagnetic induction to work. The difference is that a passive buzzer does not have oscillating source, so it will not beep if DC signals are used. But this allows the passive buzzer to adjust its own oscillation frequency and can emit different notes such as “doh, re, mi, fa, sol, la, ti”.
In this project, we need the following components.
It’s definitely convenient to buy a whole kit, here’s the link:
ITEMS IN THIS KIT
3 in 1 Starter Kit
You can also buy them separately from the links below.
Connect the cathode of the Buzzer to GND, and the anode to the digital pin 9.
5.7.tone_notone.inofile under the path of
Or copy this code into Arduino IDE.
Or upload the code through the Arduino Web Editor.
At the time when you finish uploading the codes to the R3 board, you can hear a melody containing seven notes.
How it works?
There are two points needing your attention:
noTone(): This function is used to control the sound of the passive buzzer directly and its prototype is as follows:
void tone(int pin, unsigned int frequency)
void tone(int pin, unsigned int frequency, unsigned long duration)
pin: The Arduino pin on which to generate the tone.
frequency: The frequency of the tone in hertz.
duration: The duration of the tone in milliseconds (optional)
Generates a square wave of the specified frequency (and 50% duty cycle) on a pin (so as to make the passive buzzer vibrate to make sound). A duration can be specified, otherwise the wave continues until a call to
The pin can be connected to a piezo buzzer or other speaker to play tones.
Only one tone can be generated at a time. If a tone is already playing on a different pin, the call to
tone() will have no effect. If the tone is playing on the same pin, the call will set its frequency.
Use of the
tone() function will interfere with PWM output on pins 3 and 11.
It is not possible to generate tones lower than 31Hz.
void noTone(int pin)
pin: The Arduino pin on which to generate the tone.
Stops the generation of a square wave triggered by
tone(). Has no effect if no tone is being generated.
Having known the two functions, you may grasp the codes—the installation of the array
melody and the array
noteDurations is the preparation of the subsequently several times of calling of the function
tone() and the changing of tone and duration in the loop for better effect of music play.
pitches.h: The code uses an extra file,
pitches.h. This file contains all the pitch values for typical notes. For example, NOTE_C4 is middle C. NOTE_FS4 is F sharp, and so forth. This note table was originally written by Brett Hagman, on whose work the
tone()command was based. You may find it useful whenever you want to make musical notes.
There is already a
pitches.h file in this sample program. If we put it together with the main code in one folder, the successive steps of installing
pitches.h can be omitted.
After you open the code file, if you cannot open the
pitches.h code, you can just create one manually. The steps are as
To make the
pitches.h file, either click on the button just below the
serial monitor icon and choose New Tab, or use Ctrl+Shift+N.
Then paste in the following code and save it as
/***************** Public Constants *****************/ #define NOTE_B0 31 #define NOTE_C1 33 #define NOTE_CS1 35 #define NOTE_D1 37 #define NOTE_DS1 39 #define NOTE_E1 41 #define NOTE_F1 44 #define NOTE_FS1 46 #define NOTE_G1 49 #define NOTE_GS1 52 #define NOTE_A1 55 #define NOTE_AS1 58 #define NOTE_B1 62 #define NOTE_C2 65 #define NOTE_CS2 69 #define NOTE_D2 73 #define NOTE_DS2 78 #define NOTE_E2 82 #define NOTE_F2 87 #define NOTE_FS2 93 #define NOTE_G2 98 #define NOTE_GS2 104 #define NOTE_A2 110 #define NOTE_AS2 117 #define NOTE_B2 123 #define NOTE_C3 131 #define NOTE_CS3 139 #define NOTE_D3 147 #define NOTE_DS3 156 #define NOTE_E3 165 #define NOTE_F3 175 #define NOTE_FS3 185 #define NOTE_G3 196 #define NOTE_GS3 208 #define NOTE_A3 220 #define NOTE_AS3 233 #define NOTE_B3 247 #define NOTE_C4 262 #define NOTE_CS4 277 #define NOTE_D4 294 #define NOTE_DS4 311 #define NOTE_E4 330 #define NOTE_F4 349 #define NOTE_FS4 370 #define NOTE_G4 392 #define NOTE_GS4 415 #define NOTE_A4 440 #define NOTE_AS4 466 #define NOTE_B4 494 #define NOTE_C5 523 #define NOTE_CS5 554 #define NOTE_D5 587 #define NOTE_DS5 622 #define NOTE_E5 659 #define NOTE_F5 698 #define NOTE_FS5 740 #define NOTE_G5 784 #define NOTE_GS5 831 #define NOTE_A5 880 #define NOTE_AS5 932 #define NOTE_B5 988 #define NOTE_C6 1047 #define NOTE_CS6 1109 #define NOTE_D6 1175 #define NOTE_DS6 1245 #define NOTE_E6 1319 #define NOTE_F6 1397 #define NOTE_FS6 1480 #define NOTE_G6 1568 #define NOTE_GS6 1661 #define NOTE_A6 1760 #define NOTE_AS6 1865 #define NOTE_B6 1976 #define NOTE_C7 2093 #define NOTE_CS7 2217 #define NOTE_D7 2349 #define NOTE_DS7 2489 #define NOTE_E7 2637 #define NOTE_F7 2794 #define NOTE_FS7 2960 #define NOTE_G7 3136 #define NOTE_GS7 3322 #define NOTE_A7 3520 #define NOTE_AS7 3729 #define NOTE_B7 3951 #define NOTE_C8 4186 #define NOTE_CS8 4435 #define NOTE_D8 4699 #define NOTE_DS8 49