Project Help - Multiple Piezo Speakers

Projects General Guidance
1

Hi, I am new to the forum and the Arduino platform, I have an idea for a project that is in need of some guidance. I want to recreate songs by programming the notes and duration in Arduino and have it output through a piezo speaker. I have done this successfully on a lesser scale; however, I was wondering if it would be possible to have the arduino play large chords IE like a piano or guitar by sending multiple signals to multiple piezo speakers. I would probably need about 4-5 speakers to recreate the playing of a simple piano song. Any advice would be greatly appreciated!

2

There is Tone Library that discusses having multiple instances of Tone being generated in a non-blocking method to do that.
http://code.google.com/p/rogue-code/wiki/ToneLibraryDocumentation

3

I wrote this code to play 4 tones on 4 piezos one after the other while a switch on pin 3 (with internal pullup enabled) was grounded.

while (digitalRead(3) == LOW){
    for (int i=0; i <= 511; i++){
      digitalWrite(4, HIGH);
      delayMicroseconds(500);
      digitalWrite (4, LOW);
      delayMicroseconds(500);
    }
    delay(10);
    for (int i=0; i <= 511; i++){
      digitalWrite(5, HIGH);
      delayMicroseconds(460);
      digitalWrite (5, LOW);
      delayMicroseconds(460);
    }
    delay(10);

    for (int i=0; i <= 511; i++){
      digitalWrite(6, HIGH);
      delayMicroseconds(420);
      digitalWrite (6, LOW);
      delayMicrose6conds(420);
    }
   
       delay(10);
    for (int i=0; i <= 511; i++){
      digitalWrite(7, HIGH);
      delayMicroseconds(380);
      digitalWrite (7, LOW);
      delayMicroseconds(380);
    } 
     delay(10);
  }

You could adapt something like this to run blink without delay style checking every 100uS or so to see if a button was pressed for a note, and if so if the time interval had passed to change high/low output status of the note.