Sound Sensor

[epierre]

HEllo,

I've based myself on a cookbook recipie, but it appears two issue:

• each analogread brings 1023

• the runningAverage keeps on increasing, never decreasing

  My sensor has only analog output (see sensor

  Here is the sketch:

SoundSensor2

Has anyne an idea of the analog value always the same first and then from the formulae above ?

[BulldogLowell]

@epierre

you are maxing out the voltage on the analog pin.

did you turn the potentiometer all the way down and check the input?

try to debug the sensor with a basic sketch first, turning the pot while you look at the serial monitor. You may have to add a resistor... Then once you have it working, try your MySensors sketch.

int inputPin = 3;  //check this

void setup() 
{
  Serial.begin(9600);
  pinMode(inputPin, INPUT); 
}

void loop() 
{
  Serial.print(analogRead(inputPin));
}

[epierre]

Hello,

In fact it is a digital on-off output, playing with the potentimeter I saw that... so useless for my project...

[BulldogLowell]

@epierre said:

Hello,

In fact it is a digital on-off output, playing with the potentimeter I saw that... so useless for my project...

@epierre said:

My sensor has only analog output

Your sketch is looking for an analog input, yes?

Your sensor is analog, or digital?

[epierre]

digital... sadly...

[BulldogLowell]

@epierre

We can still make it work, tripping when you have a loud noise

[epierre]

yes the only way, as a door contact... nut not to measure noise pollution...

[wmylionel]

Not sure what happened to the links in the mysensor store but here is the link to the sound sensor you need, make sure it is the one that has 4 pins, with analog output as an option.

http://www.ebay.com/itm/1pc-New-Analog-Sound-Sensor-Board-Microphone-MIC-Controller-For-Arduino/300951969384?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D24143%26meid%3D8558634634764594554%26pid%3D100005%26prg%3D10240%26rk%3D2%26rkt%3D6%26sd%3D251565637147&rt=nc

[epierre]

@wmylionel yes I know this is my fault, I tried to order from one vendor rather to have several parcel, and lacking experience I did not check about this... nor about the wrong China Exports logo... experience come to a price...

[Yveaux]

@epierre said:

wrong China Exports logo

What do you mean by this?

[epierre]

@Yveaux the CE marking but C touching the E, without space... it is not Conformité Européenne but China Export... no warranty to comply in European space... be aware...

see wikipedia

Anyway, do you know a way to solder something to have access to something analog on it ?

[Yveaux]

@epierre Hard to say without a schematic... Seems to be something like this: http://yourduino.com/sunshop/images/products/SoundSensorDiagYW-700.jpg

You can try to connect to the analog input of the comparator (pin 3 of LM393) and see if it brings anything, but only if your module is similar ofcourse...

[epierre]

@Yveaux Hello I'm trying to compile a sketch using TIMSK, but to use it on an atm 128, I would need either timex8 or timex128 which only comes through an avrlib.

This is where I am lost, I have an avrlib on my disk, should I replace it with the full one ? how can I manage that ?

thanks,

[Yveaux]

@epierre I have very little time, but sharing the sketch might help to make your problem clear...

[epierre]

@Yveaux thanks, here it is:

avr_splmeter_02b.zip

http://davidegironi.blogspot.fr/2014/02/a-simple-sound-pressure-level-meter-spl.html

[Yveaux]

@epierre Had a quick look at the code. Seems the TIMSK stuff is just for timing the ADC samples at regular interval; the TIMER1_OVF_vect sets a flag (audioget_takesample) which is scanned for in the audioget_getsamples() function.
Exactly the same behavior you can get by waiting using delay() or delayMicroseconds(), and then get the sample.
That's probably easier then getting the raw timer stuff going.

[epierre]

Since @hek is interrested, I'm revivind this post with several microphone available out there, in fact impossible to know if these use real electet ones...

@BulldogLowell I've seen you've participated here http://forum.arduino.cc/index.php?topic=208520.15 but do you think this was the good solution ? if you go through http://davidegironi.blogspot.fr/2014/02/a-simple-sound-pressure-level-meter-spl.html the questions is open...

[hek]

Hmm.. not super easy to calculate an actual sound "pollution" value or do dB calculations using this I guess.

Hmm.. Adafruit using a sample window in their example.

https://learn.adafruit.com/adafruit-microphone-amplifier-breakout/measuring-sound-levels

[hek]

How does this differ from yours @epierre ?

http://www.ebay.com/itm/Sound-Detection-Sensor-Module-Voice-Sensor-Intelligent-Vehicle-LM386-Audio-Power-/261598751181?pt=LH_DefaultDomain_0&hash=item3ce88029cd

Seems to be two chips on it..

[Moshe Livne]

@epierre I have ordered almost any kind of sound sensor on aliexpress for my washing machine sensor (at first I thought to get the beeps). They were all really bad.... I went the vibration way, but if I had to start all over again I think I would get https://www.sparkfun.com/products/9964