//Nama : Novia R TI 5B

#define ECHO_PIN 2
#define TRIG_PIN 3
int Buzzer= 12;

void setup(){
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(Buzzer, OUTPUT);
}
float readDistanceCM(){
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);
    
    int duration = pulseIn(ECHO_PIN,HIGH);
    return duration * 0.034 / 2;
    
}
void loop(){
  float distance = readDistanceCM();
  bool isNearby = distance < 100;
  digitalWrite(LED_BUILTIN,isNearby);
  if (distance < 80){
   digitalWrite(Buzzer, HIGH);
   delay(100);
   digitalWrite(Buzzer, LOW);
   delay(100);
  }
  else{
    digitalWrite(Buzzer, LOW);
  }


  Serial.print("Jarak =  ");
  Serial.println(readDistanceCM());
  delay(100);
}