const int trig = 19; 
const int echo = 18; 
const int led = 4; 

const int jarakLebih= 10;

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

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

  long durasi = pulseIn(echo, HIGH);
  float jarak = durasi * 0.034 / 10;


  Serial.print("Jarak: ");
  Serial.print(jarak);
  Serial.println(" cm");


  if (jarak < jarakLebih) {
    digitalWrite(led, HIGH); 
  } else {
    digitalWrite(led, LOW); 
  }

 
  delay(100);
}