Piezo buzzer is
an electronic device commonly used to produce sound. Light weight, simple
construction and low price make it usable in various applications like
car/truck reversing indicator, computers, call bells etc. Piezo buzzer is based
on the inverse principle of piezo electricity discovered in 1880 by Jacques and
Pierre Curie. It is the phenomena of generating electricity when
mechanical pressure is applied to certain materials and the vice versa is also
true. Such materials are called piezo electric materials. Piezo electric
materials are either naturally available or manmade. Piezo ceramic is class of
manmade material, which poses piezo electric effect and is widely used to make
disc, the heart of piezo buzzer. When subjected to an alternating electric
field they stretch or compress, in accordance with the frequency of the signal
there by producing sound.
The above image shows a very commonly used
piezo buzzer also called piezo transducer operating at DC voltage. Encapsulated
in a cylindrical plastic coating, it has a hole on the top face for sound to
propagate. A yellow metallic disc which plays an important role in the
producing sound can be seen through the hole.
Piezo buzzers are small electronic
devices that emit sounds when driven by low
voltages and currents. They are also called piezoelectric buzzers. They usually have
two electrodes and a diaphragm. The diaphragm is made from a metal plate and piezoelectric
material such as a ceramic plate.
Operation
Piezo buzzers operate using the
piezoelectric effect. A voltage that is applied to the leads causes the
piezoelectric element to shrink or stretch. This makes the diaphragm vibrate as
it bends, thereby producing sound waves. Piezo electric elements are made from
crystals, such as quartz or Rochelle salts.
Sounds
The sounds emitted may be extremely
low or ear-piercing. They may be made loud enough to cause hearing loss. These
sounds include noises such as buzzing, chirping, ringing, sirens, and beeps.
how can i increase the volume and how can i control the beep sound with different levels of volume
ReplyDeleteusing arduino please help me code