Go Down

Topic: Sound sensor to servo (Read 2608 times) previous topic - next topic


Hi all

This is my first post on here and first arduino encounter. I am as beginner as it gets!!!

With my project I am trying to achieve: read noise levels and convert them to servo motion.

At the moment I am at the first stage of building a sensor, i have an electret mic, with which i have built amplified circuit.
This is how it looks:

In arduino i get readings quite constant within 410-450
So i guess my amplifier isnt working so well

Any help would be appreciated


Which OpAmp are you using?  I have a 6 month old that I needed a trigger for a Fisher Price with IR remote when she started up.  I have bread-boarded out an LM358N that works well.  I am guessing you have a LM386N...


I was going to have lm358, but when i went to maplin electronics shop, they havent had that in stock since 2011, so i got a ts358cd and tl072cn instead!


Try this sketch, it is sloppy but it might have some pieces that you can use.

Code: [Select]
// This sketch will send out a trigger signal for FP Baby Entertainment.
// this code is public domain, please enjoy!

int IRledPin =  11;    // LED connected to digital pin 11
const int ledPin =  13;      // the number of the LED pin
const int thresholdvalue=100;//The threshold to turn the led on
const int analogPin = 0;
// The setup() method runs once, when the sketch starts

void setup()   {               
  // initialize the IR digital pin as an output:
  pinMode(IRledPin, OUTPUT);     

void loop()                     
    int mn = 1024; // mn only decreases
    int mx = 0;    // mx only increases

    // Perform 10000 reads. Update mn and mx for each one.
    for (int i = 0; i < 10000; ++i) {
        int val = analogRead(analogPin);
        mn = min(mn, val);
        mx = max(mx, val);
  int sensorValue = (mx-mn);
  digitalWrite(ledPin,HIGH);//if the value read from A0 is larger than 400,then light the LED

// This procedure sends a 38KHz pulse to the IRledPin
// for a certain # of microseconds. We'll use this whenever we need to send codes
void pulseIR(long microsecs) {
  // we'll count down from the number of microseconds we are told to wait

  cli();  // this turns off any background interrupts

  while (microsecs > 0) {
    // 38 kHz is about 13 microseconds high and 13 microseconds low
   digitalWrite(IRledPin, HIGH);  // this takes about 3 microseconds to happen
   delayMicroseconds(10);         // hang out for 10 microseconds
   digitalWrite(IRledPin, LOW);   // this also takes about 3 microseconds
   delayMicroseconds(10);         // hang out for 10 microseconds

   // so 26 microseconds altogether
   microsecs -= 26;

  sei();  // this turns them back on

void SendCode() {


// delay(1200000); // wait 20 minutes before commanding it again

Output is max-min and milliseconds


Thank you for sharing! I am going to have a go with this later today, will report back!


Always divide any such project... and questions arising (<^_^>) into it's parts...

In this case...

a) How to get a number inside the Arduino from a sound level
b) How to make a server go to a position, based on a number you have.

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131