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🔊Decibel: Real-time Noise level Measurement


  • The city life is not only fast but extremely draining due to the constant noise, be it in traffic or due to ever present construction.
  • High noise is extremely deterrent to a healthy life and it causes issues like lack of sleep, migraines and difficulty in concentration.
  • Decibel helps us to use the mobile as a sensor, here we implement noise levels, but the functionality could extend to any attributes that the mobile is capable of recording. (for example: using the camera, accelerometer, gyroscope, etc)
  • Decibel helps its users to record the noise to measure the db levels. Exceeding db levels will be reported to the concerned authorities who can help to curb it.


  • Real Time Application
  • Sound Recording in background
  • Decibel Measurement.
  • Storage on Cloud(MQTT) to save user device memory
  • Processing on cloud(Firebase)


Messages getting published to Cloud MQTT upon recording

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Data getting sent to Firebase from Cloud MQTT

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Email sent as alert .. because decibel level is high

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Usage/ Architecture

  • The user starts the Sound Recording with a button.
  • The noise is processed in the app and the db levels are measured, along with getting the location.
  • Measured db levels are sent to be stored on the MQTT cloud
  • The db levels are categorized and sorted in Firebase.
  • If the noise levels are hazardous for human-beings or other fauna, the concerned authorities will be notified.
  • Notifications will be sent in the form of emails through firebase.

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Additional Modules

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