const int trigPin = 17;   
const int echoPin = 16;  

float duration;   
float distance;   

void setup() {
 
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32! Sensor Ultrasonik Siap.");
}

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