Arduino Nano 33 IoT - Piezo Buzzer
This guide teaches you how to use the buzzer with your Arduino Nano 33 IoT. We will learn:
- How to hook up a buzzer to the Arduino Nano 33 IoT
- How to write a program for the Arduino Nano 33 IoT to control the buzzer and make sounds or a tune
Hardware Preparation
Or you can buy the following sensor kits:
| 1 | × | DIYables Sensor Kit (30 sensors/displays) | |
| 1 | × | DIYables Sensor Kit (18 sensors/displays) |
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Additionally, some of these links are for products from our own brand, DIYables .
Overview of Piezo Buzzer
The Piezo Buzzer is an electronic device that makes sounds, beeps, or even plays music.
There is a 3V-24V active buzzer available on the market. It can work with low voltage (3-5V) or high voltage (12V or more).
- When connected straight to an Arduino pin, this buzzer makes a regular sound, which is great for things like keypad feedback. When hooked up to a high-voltage source using a relay, it makes a loud noise, making it perfect for alarms.
Piezo Buzzer Pinout
A piezo buzzer usually has two pins.
- Positive (+) pin: The Arduino Nano 33 IoT sends a control signal to this pin, either directly or through a relay.
- Negative (-) pin: Attach this pin to ground (0V).
How Piezo Buzzer Works
Check out this page to learn how a piezo buzzer works: https://arduinogetstarted.com/tutorials/arduino-piezo-buzzer#content_about_piezo_buzzer
Wiring Diagram between Piezo Buzzer and Arduino Nano 33 IoT
- The diagram that shows how to connect the piezo buzzer and the Arduino Nano 33 IoT.
This image is created using Fritzing. Click to enlarge image
- Wiring diagram to connect the piezo buzzer module and the Arduino Nano 33 IoT.
This image is created using Fritzing. Click to enlarge image
Arduino Nano 33 IoT Code
Detailed Instructions
If you are new to the Arduino Nano 33 IoT, be sure to check out our Getting Started with Arduino Nano 33 IoT tutorial. Then, follow these steps:
- Connect the components to the Arduino Nano 33 IoT board as depicted in the diagram.
- Use a USB cable to connect the Arduino Nano 33 IoT board to your computer.
- Launch the Arduino IDE on your computer.
- Select the Arduino Nano 33 IoT board and choose its corresponding COM port.
- Copy the code below and paste it into the Arduino IDE.
/*
* This Arduino Nano 33 IoT code was developed by newbiely.com
*
* This Arduino Nano 33 IoT code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-iot/arduino-nano-33-iot-piezo-buzzer
*/
#include "pitches.h"
#define BUZZZER_PIN 2 // The Arduino Nano 33 IoT pin connected to piezo buzzer
int melody[] = {
NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4
};
int noteDurations[] = {
4, 8, 8, 4, 4, 4, 4, 4
};
void setup() {
for (int thisNote = 0; thisNote < 8; thisNote++) {
int noteDuration = 1000 / noteDurations[thisNote];
tone(BUZZZER_PIN, melody[thisNote], noteDuration);
int pauseBetweenNotes = noteDuration * 1.30;
delay(pauseBetweenNotes);
noTone(BUZZZER_PIN);
}
}
void loop() {
}
- Create the file named pitches.h in the Arduino IDE. To do this, either click the button right below the serial monitor icon and select New Tab, or press the Ctrl+Shift+N keys.
- Enter the file name pitches.h and press the OK button.
- Copy the code below and paste it into the file named pitches.h.
/*************************************************
* 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 4978
- Build and send your program to the Arduino Nano 33 IoT board by clicking the Upload button in the Arduino IDE.
- Listen to the music.
Modifying Arduino Nano 33 IoT Code
Let's change the Arduino Nano 33 IoT program so it plays the "Jingle Bells" song.
We only need to update the numbers in two lists: int melody[] and int noteDurations[].
/*
* This Arduino Nano 33 IoT code was developed by newbiely.com
*
* This Arduino Nano 33 IoT code is made available for public use without any restriction
*
* For comprehensive instructions and wiring diagrams, please visit:
* https://newbiely.com/tutorials/arduino-nano-iot/arduino-nano-33-iot-piezo-buzzer
*/
#include "pitches.h"
#define BUZZZER_PIN 2 // The Arduino Nano 33 IoT pin connected to piezo buzzer
// notes in the melody:
int melody[] = {
NOTE_E5, NOTE_E5, NOTE_E5,
NOTE_E5, NOTE_E5, NOTE_E5,
NOTE_E5, NOTE_G5, NOTE_C5, NOTE_D5,
NOTE_E5,
NOTE_F5, NOTE_F5, NOTE_F5, NOTE_F5,
NOTE_F5, NOTE_E5, NOTE_E5, NOTE_E5, NOTE_E5,
NOTE_E5, NOTE_D5, NOTE_D5, NOTE_E5,
NOTE_D5, NOTE_G5
};
// note durations: 4 = quarter note, 8 = eighth note, etc, also called tempo:
int noteDurations[] = {
8, 8, 4,
8, 8, 4,
8, 8, 8, 8,
2,
8, 8, 8, 8,
8, 8, 8, 16, 16,
8, 8, 8, 8,
4, 4
};
void setup() {
// iterate over the notes of the melody:
int size = sizeof(noteDurations) / sizeof(int);
for (int thisNote = 0; thisNote < size; thisNote++) {
// to calculate the note duration, take one second divided by the note type.
//e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
int noteDuration = 1000 / noteDurations[thisNote];
tone(BUZZZER_PIN, melody[thisNote], noteDuration);
// to distinguish the notes, set a minimum time between them.
// The note's duration + 30% seems to work well:
int pauseBetweenNotes = noteDuration * 1.30;
delay(pauseBetweenNotes);
// stop the tone playing:
noTone(BUZZZER_PIN);
}
}
void loop() {
// no need to repeat the melody.
}