Square Synth

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Esempio didattico di come creare un piccolo sintetizzatore audio con Arduino.

Per questo progetto sono stati usati 5 pulsanti ma è espandibile a piacere, magari con un multiplexer.

 

 

 Codice Sorgente

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/* Square Synth
 * 2009, A. Degani
 *
 * Speaker on digital pin 9
 * switch button fron digital pin 2 to 6
 *
 */
 
int speakerPin = 9;
int btn1Pin = 2;
int btn2Pin = 3;
int btn3Pin = 4;
int btn4Pin = 5;
int btn5Pin = 6;
int val1 = 0;
int val2 = 0;
int val3 = 0;
int val4 = 0;
int val5 = 0;
 
void playTone(int tone, int duration) {
  for (long i = 0; i < duration * 1000L; i += tone * 2) {
    digitalWrite(speakerPin, HIGH);
    delayMicroseconds(tone);
    digitalWrite(speakerPin, LOW);
    delayMicroseconds(tone);
  }
}
 
void playNote(char note, int duration) {
  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
 
  // play the tone corresponding to the note name
  for (int i = 0; i < 8; i++) {
    if (names[i] == note) {
      playTone(tones[i], duration);
    }
  }
}
 
void setup() {
  pinMode(speakerPin, OUTPUT);
  pinMode(btn1Pin, INPUT);
  pinMode(btn2Pin, INPUT);
  pinMode(btn3Pin, INPUT);
  pinMode(btn4Pin, INPUT);
  pinMode(btn5Pin, INPUT);
}
 
void loop() {
  val1 = digitalRead(btn1Pin);  // read input value
  val2 = digitalRead(btn2Pin);  // read input value
  val3 = digitalRead(btn3Pin);  // read input value
  val4 = digitalRead(btn4Pin);  // read input value
  val5 = digitalRead(btn5Pin);  // read input value
 
  if (val1 == LOW) {            // check if the input is HIGH
    playNote('c',10);
  }
  if (val2 == LOW) {            // check if the input is HIGH
    playNote('d',10);
  }
  if (val3 == LOW) {            // check if the input is HIGH
    playNote('e',10);
  }
  if (val4 == LOW) {            // check if the input is HIGH
    playNote('f',10);
  }
  if (val5 == LOW) {            // check if the input is HIGH
    playNote('g',10);
  }
}
 

Scarica i sorgenti square_synth.pde (1,7 KB)