void setup() {
Serial.begin(9600);
pinMode(6,OUTPUT);
pinMode(7,INPUT);
pinMode(13,OUTPUT);
}
void loop() {
digitalWrite(6,1); delay(1);
digitalWrite(6,0);
int sure=pulseIn(7,1);
int mesafe=(sure/2)/28.97;
Serial.print("Olculen Mesafe=");
Serial.println(mesafe);
if(mesafe<150)
  digitalWrite(13,1);
else
  digitalWrite(13,0);
delay(1);
}