// refatorei para usar porta analogica, inves de HIGH/LOW usa 255/0

const int buzzerPin = 13;
int ledVermelho = 3;
int ledVerde = 5;
int freq = 0;

void ligar (int led, double time){
  analogWrite(led, 255);
  delay(time);
  analogWrite(led,0);
}
void setup() {
  // put your setup code here, to run once:
  pinMode(buzzerPin, OUTPUT);

  pinMode(ledVermelho, OUTPUT);
  pinMode(ledVerde, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  for(freq = 200;freq < 300; freq ++){
   tone(buzzerPin,freq);
    delay(1);
    ligar(ledVermelho,1);
  }
  for(freq = 700;freq > 200; freq --){
   tone(buzzerPin,freq);
    delay(1);
    ligar(ledVerde,1);
  }

}