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Arduino Project: Passive Buzzer module

Posted by Fiona Su on



We can use Arduino to make many interactive works of which the most commonly used is acoustic-optic display. All the previous experiment has something to do with LED. However, the circuit in this experiment can produce sound. Normally, the experiment is done with a buzzer or a speaker while buzzer is simpler and easier to use. The buzzer we introduced here is a passive buzzer. It cannot be actuated by itself, but by external pulse frequencies. Different frequencies produce different sounds. We can use Arduino to code the melody of a song, which is actually quite fun and simple.


  • Working voltage: 3.3-5v
  • Interface type: digital
  • Size: 30*20mm
  • Weight: 4g

Connection Diagram


Sample Code

int buzzer=8;//set digital IO pin of the buzzer
void setup() 
pinMode(buzzer,OUTPUT);// set digital IO pin pattern, OUTPUT to be output 
void loop() 
{ unsigned char i,j;//define variable
{ for(i=0;i<80;i++)// output a frequency sound
{ digitalWrite(buzzer,HIGH);// sound
digitalWrite(buzzer,LOW);//not sound
delay(1);//ms delay 
for(i=0;i<100;i++)// output a frequency sound
digitalWrite(buzzer,HIGH);// sound
digitalWrite(buzzer,LOW);//not sound
delay(2);//2ms delay 

After downloading the program, buzzer experiment is finished.

Tutotials Overview

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