Projeto Piezo Buzzer

float sinVal;

int toneVal;

void setup() {

pinMode(11, OUTPUT);

}

void loop() {

alarme();

}

void alarme(){

  for (int x=0; x<180; x++) {

sinVal = (sin(x*(3.1416/180)));

toneVal = 2000+(int(sinVal*1000));

tone(11, toneVal);

delay(2); 

  }}