#define trigPin 15
#define echoPin 2
#define BuzzerPin 4
#define BuzzerChannel 0


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(BuzzerPin, OUTPUT);

  ledcSetup(BuzzerChannel, 0, 8);
  ledcAttachPin(BuzzerPin, 0);
}

void loop() {
  long duracion, distancia;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duracion = pulseIn(echoPin, HIGH);
  distancia = (duracion * 0.034) / 2;
  Serial.print(distancia);
  Serial.println(" cm");
  if (distancia > 30 and distancia < 200) {
    ledcWriteTone(BuzzerChannel, 150);
    delay(distancia); 
    ledcWriteTone(BuzzerChannel,0);
    delay(distancia);
  } else if(distancia >= 1 and distancia <= 30){
    ledcWriteTone(BuzzerChannel, 250);
    delay(distancia); 
  }else{
    ledcWriteTone(BuzzerChannel, 0);
  }

  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
}