#define trig 13
#define echo 12
//#define led 2
long time = 0;
int dist = 0;
int dis = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  //pinMode(led, OUTPUT);
  delay(5000);

}

void loop() {
  // put your main code here, to run repeatedly:
  dis = getDistance();
  Serial.print("Distance =  "); Serial.print(dis);
  Serial.println(" cm");
  /*
  if(dis >= 250){
    digitalWrite(led, HIGH);
  }
  else{
    digitalWrite(led, LOW);
  }*/
}

int getDistance(){
  digitalWrite(trig, LOW);
  delayMicroseconds(5);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  time = pulseIn(echo, HIGH);
  dist = (time/2)/29;
  delay(500);
  return dist;
}