piezoelectric speaker playing only 1 note???

I have an arduino atmega8 and i tried the 'melody' tutorial but the 8 ohms speaker is only playing the c note in different octaves and no notes in the middle...please help! Is this a speaker problem or?

When asking for help you need to provide the code you are running or a link to it. As you are following a tutorial I can only assume you are doing something wrong. Please help us by telling us what you are doing. Post the code you are trying to run. Use the # button when posting. Then we can see what you are doing wrong.

Are you sure you are using a 8 ohm speaker? You state it's a piezoelectric speaker and that may or may not be what you think it is. Some piezoelectric elements only respond to one specific frequency and are not able to reproduce a range of audio frequencies. So do you have link to what you specifically are using?

And of course your code could always be a source of problems, so post if you wish.

Lefty

im posting the code i used below but instead you can refer to http://arduino.cc/en/Tutorial/Tone

#include "pitches.h"

// notes in the melody:
int melody[] = {
  NOTE_C4, NOTE_G3,NOTE_G3, NOTE_A3, NOTE_G3,0, NOTE_B3, NOTE_C4};

// note durations: 4 = quarter note, 8 = eighth note, etc.:
int noteDurations[] = {
  4, 8, 8, 4,4,4,4,4 };

void setup() {
  // iterate over the notes of the melody:
  for (int thisNote = 0; thisNote < 8; thisNote++) {

    // to calculate the note duration, take one second 
    // divided by the note type.
    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
    int noteDuration = 1000/noteDurations[thisNote];
    tone(8, melody[thisNote],noteDuration);

    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    int pauseBetweenNotes = noteDuration * 1.30;
    delay(pauseBetweenNotes);
    // stop the tone playing:
    noTone(8);
  }
}
void loop() {
  // no need to repeat the melody.
}

pitches.h contains -

/*************************************************

  • Public Constants
    *************************************************/

#define NOTE_B0 31
#define NOTE_C1 33
#define NOTE_CS1 35
#define NOTE_D1 37
#define NOTE_DS1 39
#define NOTE_E1 41
#define NOTE_F1 44
#define NOTE_FS1 46
#define NOTE_G1 49
#define NOTE_GS1 52
#define NOTE_A1 55
#define NOTE_AS1 58
#define NOTE_B1 62
#define NOTE_C2 65
#define NOTE_CS2 69
#define NOTE_D2 73
#define NOTE_DS2 78
#define NOTE_E2 82
#define NOTE_F2 87
#define NOTE_FS2 93
#define NOTE_G2 98
#define NOTE_GS2 104
#define NOTE_A2 110
#define NOTE_AS2 117
#define NOTE_B2 123
#define NOTE_C3 131
#define NOTE_CS3 139
#define NOTE_D3 147
#define NOTE_DS3 156
#define NOTE_E3 165
#define NOTE_F3 175
#define NOTE_FS3 185
#define NOTE_G3 196
#define NOTE_GS3 208
#define NOTE_A3 220
#define NOTE_AS3 233
#define NOTE_B3 247
#define NOTE_C4 262
#define NOTE_CS4 277
#define NOTE_D4 294
#define NOTE_DS4 311
#define NOTE_E4 330
#define NOTE_F4 349
#define NOTE_FS4 370
#define NOTE_G4 392
#define NOTE_GS4 415
#define NOTE_A4 440
#define NOTE_AS4 466
#define NOTE_B4 494
#define NOTE_C5 523
#define NOTE_CS5 554
#define NOTE_D5 587
#define NOTE_DS5 622
#define NOTE_E5 659
#define NOTE_F5 698
#define NOTE_FS5 740
#define NOTE_G5 784
#define NOTE_GS5 831
#define NOTE_A5 880
#define NOTE_AS5 932
#define NOTE_B5 988
#define NOTE_C6 1047
#define NOTE_CS6 1109
#define NOTE_D6 1175
#define NOTE_DS6 1245
#define NOTE_E6 1319
#define NOTE_F6 1397
#define NOTE_FS6 1480
#define NOTE_G6 1568
#define NOTE_GS6 1661
#define NOTE_A6 1760
#define NOTE_AS6 1865
#define NOTE_B6 1976
#define NOTE_C7 2093
#define NOTE_CS7 2217
#define NOTE_D7 2349
#define NOTE_DS7 2489
#define NOTE_E7 2637
#define NOTE_F7 2794
#define NOTE_FS7 2960
#define NOTE_G7 3136
#define NOTE_GS7 3322
#define NOTE_A7 3520
#define NOTE_AS7 3729
#define NOTE_B7 3951
#define NOTE_C8 4186
#define NOTE_CS8 4435
#define NOTE_D8 4699
#define NOTE_DS8 4978

When posting code please select it and hit the # icon. It stops the forum scrambling the code.

Did you get Lefty's point piezoelectric speakers are not 8 ohms, so what do you have. A photo would be good if you don't know.

Its a 5W, 8ohms speaker.

Yep it is. How are you connecting it up?

Direct connection to an arduino pin will overload it and damage the arduino. You need to connect the pin to an amplifier or at least a transistor driver. The limit on the pins is 40mA, ohms law sows this will draw 625mA that is almost 16 times the threshold for damage.

Abhishekwalimbe:
Its a 5W, 8ohms speaker.

Ok that will work fine. However it’s NOT a piezoelectric speaker, it’s called a dynamic loudspeaker ( http://en.wikipedia.org/wiki/Loudspeaker ). Also because it has a 8 ohm voice coil it’s very possible you will damage the arduino output pin because the speaker will attempt to draw too much current from the pin. I would recommend wiring a 150 ohm resistor between the output pin and one pin of the speaker, the other speaker terminal would then wire to ground. The volumn may well then be too little for you use, but at least you won’t damage your arduino. External audio amplifier would be the only way to increase the volumn if required.

So that tends to mean your problem is within your sketch. Lets see what others think about that.

Lefty

I didnt know the threshold for the current through the pins. I didnt connent the resistor because the volume was very low. Now how do I know if the pin is damaged? Will it completely stop working? and is it beyond repairs?

how do I know if the pin is damaged?

It is because you overloaded it.

Will it completely stop working?

Yes but probably not immediately, it's life will have been shortened.

is it beyond repairs?

Yes Unless you count replacing the processor chip as a repair.

Thanks i'll replace the processor chip and see.

Thank you very much guys!

Thanks i'll replace the processor chip and see.

Going to sacrifice another one, eh? Better get two, while you're at it.

If you don't change how the speaker is connected, you'll toast the new chip, too.

Yes thanks i'll make sure i don't toast any more chips.... ]:D

You can still use the old one until it stops working, it is likely to only fail on that pin so if you avoid that pin you should be ok.