# define echoPin 2 // The number of the digital pin connected to the echo input
# define trigPin 3 // The number of the digital pin connected to the trigger output

int maximumRange = 30; // The max distance observed from the sensor
int minimumRange = 0;
long duration, distance; //duration used to calculate distance

void setup()
{
  Serial.begin(57600);
  echoSetup();
}


// just call a test function loop to see if the echo thing works
void loop()
{
  echoLoop();
}

void echoSetup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

int getEcho()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);

  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);

  distance = duration / 58.2;

/*
// error handling removed here !!!

; setup
# define LEDPin 13 // This enables the LED feedback for testing
  pinMode(LEDPin, OUTPUT); //board LED for testing

; here in getEcho
  if (distance >= maximumRange || distance <= minimumRange) {
    Serial.println("-1"); //if nothing observed ouput -1
    digitalWrite(LEDPin, HIGH); // LED will be on
  } else {
    Serial.println(distance); // prints the distance in CM
    digitalWrite(LEDPin, LOW); // LED will be off if object detected
  }
*/

  return distance;
}

void echoLoop() {
  Serial.println(getEcho());
  delay(100); // good practice not to overload the serial port
}