#include <HCSR04.h>

const byte triggerPin = 4;
const byte echoPin = 15;
const int maxCm = 405;

UltraSonicDistanceSensor distanceSensor(triggerPin, echoPin, maxCm);

void setup () {
    Serial.begin(9600);  // We initialize serial connection so that we could print values from sensor.
}

void loop () {
    // Every 500 miliseconds, do a measurement using the sensor and print the distance in centimeters.
    float distance = distanceSensor.measureDistanceCm();
    Serial.println(distance);
    delay(500);
}


/* //deprecated
#include <Ultrasonic.h>

const int trigger = 4;
const int echo = 15;

#define limite 172

Ultrasonic sensor(trigger, echo);

int distancia;
int mudarDistancia;


void setup()
{
  iniciar();
}

void loop()
{
  distancia = sensor.read();

  display();

  led();

  delay(4);
}

void iniciar()
{
  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);
}

void led()
{
  if (distancia < limite)
  {
    digitalWrite(LED_BUILTIN, HIGH);
  }
  else
  {
    digitalWrite(LED_BUILTIN, LOW);
  }
}

void display()
{
  if (mudarDistancia != distancia)
  {
    Serial.print("Distância: ");
    Serial.println(distancia);


    mudarDistancia = distancia;
  }
}
*/


/* //o simples
#include <Ultrasonic.h>

const int trigger = 4;
const int echo = 15;

#define limite 172

Ultrasonic sensor(trigger, echo);

int distancia;


void setup()
{
  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);
}

void loop()
{
  distancia = sensor.read();

  Serial.println(distancia);

  if (distancia < limite)
  {
    digitalWrite(LED_BUILTIN, HIGH);
  }
  else
  {
    digitalWrite(LED_BUILTIN, LOW);
  }

  delay(4);
}
*/