In this chapter, we will be doing several projects that can use either a piezo buzzer or a small 8-ohm speaker. By using both the buzzer and the speaker, you will be able to hear the difference between the two to help determine which is right for our project.
A piezo buzzer is compact, reliable and very inexpensive. They are easier to mount and use than a normal speaker in most electronic projects. These buzzers can emit a wide range of sounds, from soft hums to loud alerts.
A piezo buzzer, sometimes known as a piezo speaker, creates sounds a little differently than a normal speaker. The working component of these buzzers is a thin disc of piezoelectric material usually bonded to a metal diaphragm. As the voltage is applied to the piezoelectric material, it deforms. This causes the metal diaphragm to bend forward or backward. This deformation happens very rapidly...