//DEKLARASI PIN
int trig = 6; //variabel untuk trig di setting ke pin 6
int echo =  7; //variabel untuk echo di setting ke pin 7
long durasi,jarak; //membuat variabel untuk jarak dan durasi
int merah =4;
int kuning =3;
int hijau= 2;
int biru=8;
int buzzer = 5;




void setup() {
  // put your setup code here, to run once:
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(merah, OUTPUT);
  pinMode(kuning , OUTPUT);
  pinMode(hijau, OUTPUT);
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trig, LOW);
  delayMicroseconds(8);
  digitalWrite(trig, HIGH);
  delayMicroseconds(8);
  digitalWrite(trig, LOW);
  delayMicroseconds(8);
  durasi = pulseIn(echo,HIGH);//ketika menerima sinyal ultrasonic
  jarak  = (durasi / 2)/29.1 ;//mengubah durasi menjadi jarak(cm)

  if(jarak >=30){
     digitalWrite(biru,HIGH);
    digitalWrite(hijau,LOW);
    digitalWrite(kuning,LOW);
    digitalWrite(merah, LOW);
    digitalWrite(buzzer, LOW);
  }

   if(jarak <= 20)  
  {
    digitalWrite(biru,LOW);
    digitalWrite(hijau,HIGH);
    digitalWrite(kuning,LOW);
    digitalWrite(merah, LOW);
    digitalWrite(buzzer, LOW);

  }

    if(jarak <= 10)  
  { 
     digitalWrite(biru,LOW);
    digitalWrite(hijau,LOW);
    digitalWrite(kuning,HIGH);
    digitalWrite(merah, LOW);
    digitalWrite(buzzer, LOW);

  }

if(jarak <= 5)  
  { 
     digitalWrite(biru,LOW);
    digitalWrite(hijau,LOW);
    digitalWrite(kuning,LOW);
    digitalWrite(merah, HIGH);
    digitalWrite(buzzer, HIGH);

  }



   else
  { 
     digitalWrite(biru,LOW);
    digitalWrite(hijau,LOW);
    digitalWrite(kuning,LOW);
    digitalWrite(merah, LOW);
    digitalWrite(buzzer, LOW);

  }

  
  //untuk menampilkan jarak objek
  Serial.print("jarak benda : ");
  Serial.print(jarak);
  Serial.println("Cm");
  }