Using a Piezo Buzzer — SIK Circuit 11
Play a song with a piezo buzzer! Learn about the tone() function, musical frequencies, arrays for storing melodies, and how to create your own tunes.
Hướng dẫn
Parts & Introduction
Parts & Introduction
A piezo buzzer converts electrical signals into sound. Using Arduino's built-in tone() function, you can play specific musical frequencies. This sketch plays a simple melody using character arrays for notes and integer arrays for timing.
Parts Needed
- 1x Arduino Uno + USB cable
- 1x Breadboard
- 1x Piezo Buzzer
- 3x Jumper Wires
Note Frequency Reference
| Note | Freq |
|---|---|
| c | 262 Hz |
| d | 294 Hz |
| e | 330 Hz |
| f | 349 Hz |
| g | 392 Hz |
| a | 440 Hz |
| b | 494 Hz |
| C | 523 Hz |
Hardware Hookup
Hardware Hookup
Wiring Instructions
- Place the piezo buzzer in the breadboard. It has two pins — one marked with "+".
- Connect the positive pin (+) to Arduino Digital Pin 9 (PWM).
- Connect the negative pin to GND.
Tip: If the buzzer doesn't fit easily, try rotating it slightly to align with diagonal breadboard holes.
Arduino Code
Arduino Code
Open the Arduino IDE and upload the following sketch to your Arduino board.
/*
SparkFun Inventor's Kit
Example sketch 11 — BUZZER
Use the buzzer to play a song!
Hardware connections:
Buzzer positive pin (+) to digital pin 9 (PWM)
Buzzer negative pin to GND
This code is completely free for any use.
*/
const int buzzerPin = 9;
const int songLength = 18;
char notes[] = "cdfda ag cdfdg gf "; // space = rest
int beats[] = {1,1,1,1,1,1,4,4,2,1,1,1,1,1,1,4,4,2};
int tempo = 113;
void setup()
{
pinMode(buzzerPin, OUTPUT);
}
void loop()
{
int i, duration;
for (i = 0; i < songLength; i++)
{
duration = beats[i] * tempo;
if (notes[i] == ' ')
{
delay(duration);
}
else
{
tone(buzzerPin, frequency(notes[i]), duration);
delay(duration);
}
delay(tempo/10);
}
while(true){} // Play once, then stop. Remove this line to loop.
}
int frequency(char note)
{
int i;
const int numNotes = 8;
char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
int frequencies[] = {262, 294, 330, 349, 392, 440, 494, 523};
for (i = 0; i < numNotes; i++)
{
if (names[i] == note)
{
return(frequencies[i]);
}
}
return(0);
}Test & Experiment
Test & Experiment
What You Should See
You won't see anything — but you'll hear a melody playing from the buzzer! The song plays once and stops.
Troubleshooting
- No sound: The buzzer pins are easy to misplace on the breadboard. Double-check placement and make sure both pins have good contact.
- Want it to stop: Pull the buzzer out while working on other things, plug it back in to test.
Experiments to Try
- Remove the
while(true){}line to make the song loop continuously. - Write your own melody by changing the
notes[]andbeats[]arrays. - Add more notes by expanding the
frequency()function with sharps and flats. - Use a button (from Circuit 5) to trigger the melody on demand.
Vật liệu
- •SparkFun Inventor's Kit - V3.2 - 1 kitNOK 999.20
- •Arduino Uno R3 - 1 pieceTạm thời
- •Breadboard - 1 pieceTạm thời
- •Piezo Buzzer - 1 piece
- •Jumper Wires - 3 piecessNOK 39.20
Công cụ yêu cầu
- Computer with Arduino IDE
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