DIY IoT Decibel Meter | Sound Level Meter

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A sound level meter is used for acoustic (sound that travels through the air) measurements. The best type of microphone for sound level meters is the condenser microphone, which combines precision with stability and reliability.
Decibel meter is commonly used in noise pollution studies for the quantification of different kinds of noise, especially for industrial, environmental, mining, and aircraft noise.
In this IoT project, we will make Decibel Meter using ESP8266 & Sound Sensor. This DIY project is very simple and can be made at home for monitoring loudness in dB. We will use Nodemcu ESP8266, Sound Module & Display either 16×2 LCD Display or OLED Display. The Sound Sensor will detect the sound and convert it into an analog voltage which is read by Nodemcu ESP8266. The Nodemcu connects to wifi and uploads the data to Thingspeak Server.
Source Code/Program: how2electronic...
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Website: how2electronic...
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[@SA-oj3bo]

Hi, Can you help me to understand if it is possible to get accurate decibel values without calibration when using microphone with amplifier.? Thx!

[@patrik2295]

Hello! Maybe its a bad question, but are these oled displays come soldered?

[@beezowigy9155]

yes

[@mrapsouthern]

Line 84 in your video - this is not how you convert a scalar value, like pressure or volts, to decibels. In your video you do show the correct formulas, but you don't appear to use them in your code!!!

[@SA-oj3bo]

Hi, Can you help me to understand if it is possible to get accurate decibel values without calibration when using microphone with amplifier.? Thx!

[@xfabiosoft]

You are right... i experienced with some values: mic_value = analogRead(MIC_PIN); dB_value = (mic_value+83.2073) / 11.003; //convert ADC value to dB using regression

[@jaimesantiagohernandez]

You say this is wrong: float db = map(peakToPeak,20,900,49.5,90); how it is corrected, with what it is replaced. maybe with the formula from the video in 1:39 min. Any suggestions? Thanks

[@themaxduffman526]

Hi ! Digital output on analog input... ...nice... :D

[@vaibhavihiremath1580]

Hi
The time is in milliseconds or microseconds??
And we are unable to get the output on the LCD display but the LCD display is on

[@szarkul]

funny things is digital output of sensor connected to analog input :D

[@HwangHwang23]

Is this for arduino only? Couldn’t i try to do this with raspberry pi? I just have same parts but raspberry pi.

[@d3891]

Great ...what i wish to do is monitor sound remotely ...any ideas how i can have the sensor in one location but to read the results at home...that means in a different location... by having the sensor transmit them via wifi...cheers

[@jktipan87]

I guess you can use a LoRa module to send and another LoRa module to receive all of them connected to Arduino

[@amir27yearsago72]

Can you do simple project like use ..Sound sensor , esp8266 , and connect to Adafruit for data monitoring and get notifications if they gone to limit we set like security system from IFTT by telegram notification message.

[@Lrak974]

Hi, good project !
Can you explain how you complete your int db = map(peakToPeak,20,900,49.5,90); function for calibration ??? what is "20" , "900", "49.5", "90"??

[@mrapsouthern]

that line is completely wrong - that simple linear map function is not how you calculate sound pressure level (dB) from a relative sound pressure (Pa) or voltage.

[@starrovers13]

@@mrapsouthern thanks, but what should be the correct code instead? thx

[@electronic7979]

Excellent project

[@mokarrom_z2]

Hi, how did you get the DB conversion formula in the Arduino code?

[@HowtoElectronics]

By mapping the minimum to maximum value and calibrating with the standard db value when you are in silent room.

[@mokarrom_z2]

@@HowtoElectronics Are you planning on doing this project using a sound sensor and nodemcu to upload data on MySQL server? I am kind of stuck at a point and Thank you very much.

[@mrapsouthern]

@@HowtoElectronics that wont work!

[@charlesphillips1642]

Will it go up past or around 200db I'm doing 155db in my car stereo and would like to make this

[@HowtoElectronics]

Not at all. It will sense up to 93db only. Its microphone is so powerful enough to pickup such a high sound.

[@muhammadhazim1826]

@@HowtoElectronics can we adjust the db to 125db?

[@jerzyszczepanski9792]

Hi. Could anybody please post a build of Arduino decibel meter for an Airgun with shown Max last reading. Small size would be preferable, possibly Arduino Nano and Oled screen. Most Android Phone Apps don't work correctly as the phone kills the Microphone sensitivity automatically and sampling isn't fast enough. Thanks in advance. Good Video BTW.

[@electroniquepassion]

Nice 👍✌️🇫🇷

[@mamtakhadka1314]

Good ❤️❤️

[@yogeshitaliya473]

How to😉😀😉

[@robinnorfolk628]

You not made the circuit but assembled lol.

[@domenzorman5467]

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