/*
Programma:prova_buzzer.pde
 Versione: 1.0
 Collaudo modulo buzzer
 di Adriano Gandolfo
 */
 
void setup() {
  pinMode(2, OUTPUT); // Imposta la porta di collegamento per il buzzer
}

void loop() {
  buzz(2, 100, 500); // emissione suono a 100Hz
  delay(1000); // Attesa
  buzz(2, 200, 500); // emissione suono a 200Hz
  delay(1000); // Attesa
  buzz(2, 300, 500); // emissione suono a 300Hz
  delay(1000); // Attesa
  buzz(2, 400, 500); // emissione suono a 400Hz
  delay(1000); // Attesa
  buzz(2, 500, 500); // emissione suono a 500Hz
  delay(1000); // Attesa
  buzz(2, 1000, 500); // emissione suono a 1 KHz
  delay(1000); // Attesa
  buzz(2, 2000, 500); // emissione suono a 2 KHz
  delay(1000); // Attesa
  buzz(2, 4000, 500); // emissione suono a 4 KHz
  delay(1000); // Attesa
}


void buzz(int targetPin, long frequency, long length) {
  long delayValue = 1000000/frequency/2; // calculate the delay value between transitions
  //// 1 second's worth of microseconds, divided by the frequency, then split in half since
  //// there are two phases to each cycle
  long numCycles = frequency * length/ 1000; // calculate the number of cycles for proper timing
  //// multiply frequency, which is really cycles per second, by the number of seconds to 
  //// get the total number of cycles to produce
  for (long i=0; i < numCycles; i++){ // for the calculated length of time...
    digitalWrite(targetPin,HIGH); // write the buzzer pin high to push out the diaphram
    delayMicroseconds(delayValue); // wait for the calculated delay value
    digitalWrite(targetPin,LOW); // write the buzzer pin low to pull back the diaphram
    delayMicroseconds(delayValue); // wait againf or the calculated delay value
  }
}