How to measure deciBel with big sound sensor (model KY-038)

Using Arduino Sensors
1

Hello fellas,

I'm want to use a big sound sensor model KY-038 to measure the amount of sound in dB. It as a analog output, but i don't know how to convert that data to dB. Can anyone help me out with some proper code or a handy link (both is also welcome :slight_smile: ).
The sound sensor doesn't require a special library and works on 5V

2

dB = 20*log10(V/V0)

3

As Mr. Remington pointed out in the formula, DB is a ratio, not a quantity with units. You must decide what your is V0, or standard you are comparing your sound to, then you can do the computation. And you are measuring volts, not watts of power.

Paul

4

thanks both of you!

I'm going to try that ratio.