Introduction to Buzzer

This is a little 12mm round speaker that operates around the audible 2kHz Range. you’ll use these speakers to make simple music or user interfaces. This is not a real piezoelectric speaker but behaves similarly. 

Rather than a crystal that vibrates with an electrical current, this small speaker uses an electromagnet to drive a skinny metal sheet. meaning you would like to use some sort of AC to urge sound. the great news is that this speaker is tuned to reply best with a square wave (e.g. from a microcontroller).

Buzzer Pin Out:

  • VCC (3.3 V to 5 V)
  • GND
  • I/O Control

Features :

Passive buzzer features are:

  1. Passive internal shocks without source- so if you can not make it with a DC signal tweet. Must be a square wave 2K ~ 5K to drive it
  2. Sound frequency control- you can make a “more than a meter hair Suola” effect.
  3. In some special cases- you can reuse a control and LED mouth

Active buzzer features are:

  1.  An active buzzer with a concussion internal source- so long as it will be called an energized
  2. The program is easy to control- SCM can let a high-low sound- while passive buzzer did not.

Read Alos:


Piezo buzzers require less power since they use little current. Their usual current draw is less than 10mA. They are typically less expensive than a small speaker depending on the sound output needed.


The main disadvantage of a buzzer is 1. Controlling is a little hard, 2. Generates Annoying Sound, 3. Training is necessary to know how to repair the condition without just turning it off.