thank you for the informative reply sir Grumpy_Mike and sir dhenry,..

i will study your suggested hardware & software solution to understand them better,
with this, i hope this project of mine will be up and running soon,..
again, thank you kind sirs,..

what i am trying to make sir is a blow sensor,
so, is it just natural for the reading to go down.?

ahm, i'm making this project at home so i don't have an oscilloscope sir,.
sorry,..

good day sir,
i am expecting that when i give an input to the mic,
the reading will give an above 550 value throughout the duration i am giving it an input.

is there something i can do to make it consistent? or its just natural for the mic to give
a low value time to time when i give an input to the mic?

electret condenser mic to A0 of the analog input.

here is my code:

Code:

/*
this sketch will test if the electret mic will pick up
signal or input.

the output is generated in the serial monitor(ctrl+shift+m).

the output will show the range of frequencies that the mic
support.
*/

int senseMic = 0
; //analog pin of gizduino

void setup(){
 
 Serial.begin(9600); 
}

void loop(){
 Serial.println(analogRead(senseMic));
 delay(500);
}

the schematic diagram:


the reading in serial monitor:

Code:

539
535
533
533
533
530
535
672  //i give a continuous input to the mic fro here to..
252
757
136
757
758 //..here
533
532
536
536
546
562
170  //aslo from here to..
487
758
310
758
758
707  //..here
547
548
542
545
546

what should i do or should i add/take to make the reading more consistent?

Code:

At least a 120 ohms or more to stay below the 40ma absolute maximum current draw limit from an output pin. But keep in mind that means the resistor will 'consume' about 95% of the 'audio power' leaving a wimpy amount of about 13 milliwatts of audio power to drive the the 8 ohm speaker. You should look for a speaker with a much higher voice coil resistance or do as most anyone wanting to drive a 8 ohm speaker, use a audio amplifier stage or module to drive the speaker.

thanks for the heads up sir,.. i will research and study about audio amplifier that you mentioned,..

sir PaulS,

i have my ckt up and running now, thanks for the advice.
this proves my knowledge in C is still lacking, better study more. 

Code:

You risk damaging your Arduino connecting an 8 Ohm speaker to it without a series resistor.

thank you for the caution sir, i'm kind of new with arduino, my bad.
anyway, my supply is just 5 volts, what resistor value should i use?

Code:

You are referencing the 23rd, 24th, and 25th elements of an array that has 3 elements. Not a good thing.

kind sir, can you suggest anything to correct this?

3 tact switch, 1st pin connected to 23, 24 and 25 while 2nd pin is connected to ground.
8 ohm speaker, negative in ground while positive pin is connected to pin 8.
all components are operational and fine.
i just have problems with the code and i dont know where i got wrong,..   

Code:

#include "pitches.h"

byte button[] = {23, 24, 25};  //create array of buttons connected at pin 23, 24 and 25
byte speakerpin = 8;  //sets speaker pin to pin 8
byte buttonset ;  //variable for reading button push

void setup() {
  // set all pins to output
  pinMode(speakerpin, OUTPUT);
  for(int x=23; x<26; x++) {
    pinMode(button[x] , INPUT);
    digitalWrite(button[x] , HIGH); // buttons are in the high position
 }
 }

void loop(){
for(int x=23; x<26; x++){
  buttonset = digitalRead(button[x]);
   
      if(buttonset == LOW){
         if(x == 23){ // if button on pin 2 is pressed
    //        if (buttonset == LOW){
            tone(8, NOTE_C4);    //stores the note's wavelength to be played.
      //   }
       }
         if(x == 24){
    //        if (buttonset == LOW){
            tone(8, NOTE_D4);
      //   }
       }
         if(x == 25){
     //       if (buttonset == LOW){
            tone(8, NOTE_E4);
      //   }
       }
         else
            noTone(8);
      }
   } 
}

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