Sound Sensor – Working & Its Applications

• A SOUND SENSOR is a sensor that converts the sound signals or we can say vibrations created by sound into an electrical signal.
• It detects the sound wave through its intensity and accordingly converts it with the help of an inbuilt capacitor.

Working Principle of Sound Sensor

• The principle is similar to our working of ears.
• Sound is a waveform of energy that is produced in the form of mechanical vibration of moving air or water molecules.

• microphone- which consist of an in-built diaphragm that helps convert the sound vibrations which are created by moving air molecules into electrical signals.
• diaphragm converts these vibrations with the help of a coil. The diaphragm is made up of magnets coiled by metal wire.
• SOUND SENSOR HAVING MICROPHONE WITH MAGNETIC COIL
• The microphone has an inbuilt diaphragm. Whenever sound waves hit the diaphragm, magnets vibrate and at the same time coil induces the current.

SOUND SENSOR HAVING CAPACITIVE MICROPHONE

• Here, a capacitive microphone, peak detector, and an amplifier (LM386, LM393, etc.) that’s highly sensitive to sound.
• Such sound waves cause the diaphragm in the microphone to vibrate and are responsible for capacitance change. the change in capacitance is then amplified and digitized.

Applications of Sound Sensor

• 1. Detect sound pollution and more with SPCPM.
• A Solar Powered City Pollution Monitor (SPCPM) can help you sense overall air and sound quality in the city as sound pollution is a common issue nowadays.

• 2. Baby Monitor with Sound Sensor
• If you’re a parent or caretaker that’s always worrying about your baby regarding its health, temperature, environment, etc., this smart baby monitoring project is the one for you!

Other Applications:

• Security system(Office or Home)
• Home Automation
• Robot world
• Smart Phones
• sound recognition
• Audio amplifier
• Sound level recognition