Sound Sensor Working and Applications

Nowadays, a lot of safety events are initiated due to some kind of sound which involves sound, aggressive behavior, breaking glass. But cameras with inbuilt sound exposure features can add huge value to the security system. Because there are real and possible incidents, they automatically give alerts. Then immediately they activate quick and appropriate tasks to reduce the results. This article discusses the overview of sound sensor modules.

What is a sound sensor?

Sound sensor is a type of module used to notice sound. Generally, this module is used to detect the intensity of the sound. Applications of this module mainly include switches, security, as well as monitoring. The accuracy of this sensor can be changed for ease of use.

This sensor employs a microphone to provide input to buffer, peak detector and amplifier. This sensor notices a sound, and the microcontroller is used to o/o. P voltage processes the signal. After that, it performs the necessary processing.

This sensor is able to determine the level of noise within the DB or decibel at 3 kHz 6 kHz frequencies approximately wherever the human ear is sensitive. Android application named Decibel Meter is used to measure sound level in the smartphone.

Pin Configuration

This sensor have three pins which are following.

Pin1 (VCC)3.3V DC to 5V DC
Pin2 (GND)This is aground pin
Pin3 (DO)This is an output pin


The working principle of this sensor relates to human ears. Because the human eye involves a diaphragm and this is the main function of the diaphragm, it uses vibrations and changes in signals. While in this sensor, it uses a microphone and is the main function of this, it uses vibration and the current otherwise changes the voltage.


  • The range of operating voltage is 3.⅗ V
  • The operating current is 4~5 mA
  • The voltage gain 26 dB ((V=6V, f=1kHz)
  • The sensitivity of the microphone (1kHz) is 52 to 48 dB
  • The impedance of the microphone is 2.2k Ohm
  • The frequency of m microphone is16 to 20 kHz
  • The signal to noise ratio is 54 dB


  • Security system for Office or Home
  • Spy Circuit
  • Home Automation
  • Robotics
  • Smart Phones
  • Ambient sound recognition
  • Audio amplifier
  • Sound level recognition (not capable to obtain precise dB value)

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