#define echoPin 10
#define trigPin 9
#define buzzer 8
#define led 11

long duration;
int distance;


void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}


void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration*0.034/2;

  Serial.print("jarak:");
  Serial.print(distance);
  Serial.print("cm");

  if (distance <=35) {
    digitalWrite(buzzer, HIGH);
    digitalWrite(led, HIGH);
  }else {
    digitalWrite(buzzer, LOW);
    digitalWrite(led, LOW);
  }

  delay(500);