Sound analyser ( Gunshot Detector ) with arduino

Question

Hi all. I'm new in arduino and electronics. So i need your help

I'm thinking to make gunshot detector with arduino mega.

My plan is that:

Firstly a microphone gets sound and arduino analyses the sound is it a gun or not.

This analysing will be with " sound frequency ". ( but I'm not sure can i disiungish the sounds with their frequencies )

Than a lcd screen will write " gunshot detected, or M-16 rifle shot detected" or what else

Here is my questions

1. Which type of microphone will i use?

2. How do microphone know it is gun sound? ( frequency, decibel, amplitute or what speciality of sound )

3. I heard about FFT ( fast fourier transform ) any idea to use FFT?

Any suggestions?

Thank you all

Former Member · Answer

I have no idea what you want to use this set up for. Will it become a staionairy set up or is it somethiong you will carry around? The approach will be completely different I wonder how much Decibel a gun shot makes at 200 meters. And is it not "over voiced" by other surrouinding sounds. Check out this super tutorial for the gun shot detection. http://www.youtube.com/watch?v=y0Q0ERSP24A I used this principle (and circuit) for the frequency counter. I used a 1 euro microphone as Afrotechmods explains. Check out his other tutorials too. I learned so much from him. They are very, very helpfull, fun to watch and so easy to understand. If you use a 5 V power supply, the trigger will be a digital on/off signal for a digital pin. Or you can read it on one of the analog pins.

JoaoSeverino · Answer

For the microphone to use I suggest to use a piezo element and you should check this video where a piezo element is used to detect a loud noise and trigger a camera http://www.youtube.com/watch?v=R8_dAgaBBdI Some changes and it adapts perfectly to your project

fustini · Answer

This reminded me of this project to control home automation with whistling: http://befinitiv.wordpress.com/2012/04/01/control-your-home-devices-by-whistling/ FFT software running on Linux is used: http://www.fftw.org/ This specific software wouldn't run on an Arduino but you probably could run it on a single board computer (SBC) that runs Linux like the Raspberry Pi, BeagleBone or OLinuXino.

Sound analyser ( Gunshot Detector ) with arduino

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