gistfile1.txt

/*
 * simple example of a synthesizer
 *breadboard schematics: http://www.flickr.com/photos/28914418@N02/3751185789/sizes/o/
 * 
 * rights: http://tinyurl.com/by-sa-3-0
 */
int speakerPin = 9;
int tempo   = 0;
int potPin1 = 0;
int potVal1 = 0;
int potPin2 = 1;
int potVal2 = 0;
int potPin3 = 2;
int potVal3 = 0;

void playTone(int tone, int duration) {
  if (tone == 0){
    duration = -1;
  }
  if (duration == 0){
    duration = -1;
  }
  for (long i = 0; i < duration * 1000L; i += tone * 2) {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);
  }
}

void setup() {
  pinMode(speakerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  potVal1 = analogRead(potPin1);
  potVal2 = analogRead(potPin2);
  potVal3 = analogRead(potPin3);
    if (potVal3>1000) {
    potVal3=1000;
  }
  if (potVal2>potVal3) {
    potVal2=potVal3;
  }
  Serial.print("pot1:");
  Serial.print(potVal1);
  Serial.print(" - pot2:");
  Serial.print(potVal2);
  Serial.print(" - pot3:");
  Serial.println(potVal3);

  playTone(potVal1*2, potVal2);
    
    
    // pause between notes
    delay(potVal3-potVal2); 

}