const int trigPin = 10;
const int echoPin = 9;
const int iLEDPin = 13;
const int iBuzzerPin = 12;
float duration, mesafe;
void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(iLEDPin, OUTPUT);
  pinMode(iBuzzerPin,OUTPUT);
  digitalWrite(iLEDPin, HIGH);
  delay(1000);
  digitalWrite(iLEDPin, LOW);
  Serial.begin(9600);
}
void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  mesafe = (duration*.0343)/2;
  Serial.print("Uzaklık: ");
  Serial.println(mesafe);
    delay(700); // 0.7 snde bir sonuc 
  if (mesafe < 50) { //mesafe 50den kucukse led yanar..
    digitalWrite(iLEDPin, HIGH);
    digitalWrite(iBuzzerPin,HIGH);
    delay(1);
          }
  else {
    digitalWrite(iLEDPin, LOW);
    digitalWrite(iBuzzerPin,LOW);
    delay(1);
  }
}