long time,distance;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(13, INPUT);
pinMode(12, OUTPUT);
pinMode(2, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(12,0);
delay(1000);
digitalWrite(12,1);
delay(1000);
digitalWrite(12,0);
time=pulseIn(13,1);
distance=time/58;
Serial.println(distance);
if(distance<=100)
{
  digitalWrite(2,HIGH);
  delay(1000);
}
else
{
digitalWrite(2,LOW);
delay(1000);
}
}