From: Jason White <whitewaterssoftwareinfo@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Tue, 6 Oct 2020 16:53:10 -0700
Subject: [EE] Looking for technique to record audio after level exceeds some
	value
Thread-Topic: [EE] Looking for technique to record audio after level exceeds
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I'd be tempted to use the phone as an internet connected webcam/microphone.
Steam audio/video from the phone and record it on the PC.

On Tue, Oct 6, 2020 at 3:43 PM The Tyrers <paultyrer@etczone.com> wrote:
>
> I would use a Sd card based security camera, Records prior to sound and
during.
>
>
> > On Oct 6, 2020, at 3:18 PM, Dwayne Reid <dwayner@planet.eon.net> wrote:
> >
> > Good day to all.
> >
> > I have a peculiar problem and I am hoping there is an off-the-shelf
solution.
> >
> > It is approaching winter in Canada, which means that heating season
> > is about to be on us.  One of the roof-top HVAC boxes on our building
> > appears to have a gas ignition problem.  I hear explosions both quiet
> > and loud when the heater turns on.
> >
> > This is obviously a gas ignition problem and we have called the
> > service people a couple of times to get this fixed before the heat
> > exchanger becomes damaged.  Specifically, what I think is that the
> > fuel gas (Natural Gas) is accumulating in some area away from the
> > ignitor, reaching some level higher than the Lower Explosive Level,
> > then some traces of the fuel reaching the ignitor.
> >
> > But the service people can't see any problem and they are questioning
> > whether I am just imagining the problem.
> >
> > What I would like to do is to set up one of my spare Android devices
> > with the microphone in the heating duct.  But I need some way to have
> > the device record just of few seconds BEFORE the explosion occurs as
> > well as a few seconds AFTER the explosion occurs.
> >
> > Kind of like how pre-trigger works with a DSO.
> >
> > I've been looking but have not yet found an app that does this.  I'm
> > hoping that someone here might have a suggestion.
> >
> > Note that I'm not married to the idea of using an Android device -
> > just that's what I have handy.  I could also set up a laptop or
> > netbook running Windows or DOS if I can find an appropriate application=
..
> >
> > I do have a fair amount of audio equipment here - mixers, preamps of
> > various types, microphones ranging from really inexpensive to stupid
> > expensive, audio recorders of various types.
> >
> > Problem is that none of the audio recorders that I have (DAT, SD-card
> > based, Compact Flash based, etc) have the capability to continuously
> > record a buffer, then capture several seconds before and after the
> > loud sound occurs.
> >
> > Individual files with time stamps would also be desirable.
> >
> > IBM compatible Shareware or paid Android app is just fine.
> >
> > Suggestions gratefully accepted.
> >
> > dwayne
> >
> > --
> > Dwayne Reid   <dwayner@planet.eon.net>
> > Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
> > 780-489-3199 voice   780-487-6397 fax   888-489-3199 Toll Free
> > www.trinity-electronics.com
> > Custom Electronics Design and Manufacturing
> >
> > --
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>
>
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Jason White


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Jason White
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