db or noise level of file RPi is playing

[neverenouph2002]

Hello.

I have a project I am working on where when a sensor is tripped, a random audio file is played (sound effect) and I want to turn on an LED when the sound file reaches a certain db level or noise level. Think ,,,light an LED when a gun shot is played sort of thing. I am currently using python to play the audio file in a callback by using os.system and sending it to mpg123.

The question is, does anyone know of a way to get the db or noise level of a file the raspberry pi is playing? Im sending the sound out the 3.5 jack if that matters.

[LTolledo]

Light up a LED based on sound amplitude?

the closest thing I have in mind is using a VU meter based on LM3914 or LM3915 (for 10 LED) or KA2284 (for 5 LED), using the signal from the audio jack.

have both of those...

a simple transistor circuit to drive a single LED might do the same job.....

[neverenouph2002]

I could probably get that to work. I was hoping to be able to do it in software so I wouldn't need to add the additional hardware circuit . Thanks.

[LTolledo]

I could probably get that to work. I was hoping to be able to do it in software so I wouldn't need to add the additional hardware circuit . Thanks.

try this at you favorite search engine

Raspberry Pi sound reactive LEDs