Setup average sound volume

Projects Programming
1

Hi all!

I am making my first project with Arduino, everything is going pretty well but I am stuck in the last part of code which I haven't managed to write yet as I don't understand how to do.

So my project is a Rocking Crib (as seen in the picture).

COMPONENTS:

arduino YUN

sound detector: Sound Detector Hookup Guide - SparkFun Learn

medium servo (60 degrees)

MORE IN DEPTH:

I will attach the microphone and when the baby cries, the Arduino will tell the servo to move and lull the baby (and crib).

I already managed to have the servo and microphone working.

The only problem is this:

the servo starts working only when the microphone senses loud noise and just for that amount of time. So let's say there's loud noise for 3 milliseconds, it will sweep only for these 3milliseconds. Here is the code I have:

#include <Servo.h>

#define PIN_ANALOG_IN A0 //microphone reading
#define THRESHOLD 400 //point when crib starts moving

Servo myservo; // create servo object to control a servo
// twelve servo objects can be created on most boards
int sensorValue;
int pos; // variable to store the servo position

void setup()
{
pos = 0;
Serial.begin(9600);
myservo.attach(5); // attaches the servo on pin 5 to the servo object
}

void loop()
{

sensorValue = analogRead(PIN_ANALOG_IN);

if(sensorValue > THRESHOLD ) //microphone value
{

for(pos = 0; pos <= 60; pos += 1) // goes from 0 degrees to 180 degrees
{
Serial.println(pos);
// in steps of 1 degree
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(30); // waits 15ms for the servo to reach the position
}
for(pos = 60; pos>=0; pos-=1) // goes from 180 degrees to 0 degrees
{
myservo.write(pos); // tell servo to go to position in variable 'pos'
delay(30); // waits 15ms for the servo to reach the position
}
}
} [/b][/b]

What I would like is the Arduino to make an average for let's say 10 seconds. If in those 10 seconds the noise is above let's say 400, then it will start sweep for at least 1 minute or so. It won't stop in the moment the noise stops.

Then it will check again, make average and from the average it will sweep or stop again.

Is there any good soul that would give me a little hand with it? I am really new on the Arduino world and I am so stuck with this last little piece. argh! Any little help is very much appreciated :slight_smile:

Thank you so much in advance,

Marcella

Photo on 26-08-2014 at 14.06.jpg
Photo on 26-08-2014 at 14.06.jpg1080×720 181 KB

2

What I would like is the Arduino to make an average for let's say 10 seconds.

So, what is the problem? A while loop to spin for 10 seconds is trivial.

then it will start sweep for at least 1 minute or so. It won't stop in the moment the noise stops.

Same question; different interval.

3

you can start with something like this...

you should try to get the delays out of your servo sweep...

not tested

#include <Servo.h> 
#define PIN_ANALOG_IN A0 //microphone reading
#define THRESHOLD 400 //point when crib starts moving

Servo myservo;  // create servo object to control a servo 
int sensorValue;
int pos;    // variable to store the servo position 
unsigned long rockInterval = 2 * 60000UL; // two minutes 
unsigned long startTime;
//
void setup() 
{ 
  pos = 0;
  Serial.begin(9600);
  myservo.attach(5);
} 
//
void loop() 
{
  if (analogRead(PIN_ANALOG_IN) > THRESHOLD)
  {
    startTime = millis();
  }
  if (millis() - startTime < rockInterval)
  {
    rockBaby();
  }
} 
//
void rockBaby()
{
  for (pos = 0; pos <= 60; pos += 1) // goes from 0 degrees to 180 degrees 
  {     
    Serial.println(pos);
    // in steps of 1 degree 
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(30);                       // waits 15ms for the servo to reach the position 
  } 
  for(pos = 60; pos>=0; pos-=1)     // goes from 180 degrees to 0 degrees 
  {                                
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(30);                       // waits 15ms for the servo to reach the position 
  } 
}
4

Hey guys,

thank you so much for your replies.

I think I managed to make it work, a good friend of mine sent me some code just now as well!!!

Will send you my project once finished

THANK YOU SO MUCH!

Marcella