void setup(){
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  pinMode(12, INPUT);
  pinMode(15, OUTPUT);
  pinMode(14, OUTPUT);
}
void loop(){
  int time;
  int distance;

  digitalWrite(13, LOW);
  delay(100);
  digitalWrite(13, HIGH);
  delay(100);
  digitalWrite(13,LOW);

  time=pulseIn(12,HIGH);
  distance=time * 0.0346/2;

  Serial.println(distance);
 if (distance>100){digitalWrite(15, HIGH);}
 else{digitalWrite(15, LOW);}

 if(distance<100){digitalWrite(14, HIGH);}
 else{digitalWrite(14, LOW);}
}