#define trigPin 5
#define echoPin 6
int Buzzer = 4;

int duration, distance;

void setup() {
  Serial.begin (9600);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(Buzzer, OUTPUT);
}

void loop() {
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;

  if (distance < 10)
  {
    Serial.println("Cm \n");
    Serial.print("buzzer akan berbunyi = ");
    Serial.print(distance);
    digitalWrite(Buzzer, HIGH);

  }
  else {
    Serial.println("buzzer tidak berbunyi");
    digitalWrite(Buzzer, LOW);
  }
}