[chbot] Simple Sound Level Meter Circuit

[m.beckett at amuri.net]

Spencer

Not sure if the 'noise' is actually from the cct or the
detection process.

We had some issues with the Arduino analog and false
or noisy
readings.
http://www.element14.com/community/thread/23967?start=15&tstart=21

_It's
a bit messy with the OP not exactly following the suggestions, but
Message 21 onwards should show that the analog needs some time to
settle._

Not sure your code, but send me an email if you like.
I do
have some audio peak hold circuits we used in lighting controllers, that
worked well.

Mark

On Sat, 17 Aug 2013 22:57:09 +1200, Spencer Travers
wrote:
> Hi all,
> 
> I am working on a classroom environment monitor
project with a group
> of intermediate students (11-13 year olds). One
component of this
> project is a very basic sound level meter connected
to an Arduino. We
> have tried a Freetronics microphone interface board
(schematics
> at
http://www.freetronics.com/products/microphone-sound-input-module
> [1])
with poor results. The module seems to be very noisy and the
> output
appears to oscillate. 
> 
> We are essentially after a circuit to sample
the background noise
> level and provide a 0-5 V output for the Arduino
ADC to read. We are
> not too concerned about accuracy as the output
will be a traffic light
> red/orange/green display. If the Freetronics
module had worked as
> advertised it would have been ideal. 
> 
> Can
anyone out there suggest a modification to the board we have or an
>
alternative circuit?
> 
> Spencer
> 
> Links:
> ------
> [1]
>
http://www.freetronics.com/products/microphone-sound-input-module#.Ug9RbZJ9t-0


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