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#define trigPin 31
#define echoPin 33
char blueToothVal;           //value sent over via bluetooth
 
void setup()
{
 Serial.begin(9600); 
 //pinMode(13,OUTPUT);
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
}
long getDistance() {
  long duration, distance;
  digitalWrite(13,HIGH);            //switch on LED
  digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10); // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  
  if (distance >= 400 || distance <= 0){
      distance = getDistance();
  }
  
  return distance;
}
 
 
void loop()
{
  
  if(Serial.available()>0)
  {
    blueToothVal=Serial.read(); //read it
  }
  if (blueToothVal=='x')
  {
    
    
      Serial.print(getDistance());
      Serial.println(" cm");
    
  }
  blueToothVal = 'c';
  delay(1000);
}