int trig=3;
int echo=2;
int hijau=5;
int kuning=6;
int merah=7;
int buzz=8;

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

}

void loop() {
    // put your main code here, to run repeatedly:

  digitalWrite(trig, LOW);
  delayMicroseconds(10);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);


  long durasi = pulseIn(echo,HIGH);
  int jarak = durasi/58;
  delay(200);

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



 if ( jarak <=10){
  tone(buzz, 50);
  digitalWrite(merah, HIGH);
  delay(50);
  noTone(buzz);
   digitalWrite(merah, LOW);
  delay(50);
 }
 else if (jarak <=50) {
  tone(buzz, 50);
  digitalWrite(kuning, HIGH);
  delay(100);
  noTone(buzz);
   digitalWrite(kuning, LOW);
  delay(100);
}
 else if (jarak >50){
  tone(buzz, 50);
  digitalWrite(hijau, HIGH);
  delay(200);
  noTone(buzz);
   digitalWrite(hijau, LOW);
  delay(200);
 }
else {
  tone(buzz, 0);
  digitalWrite(merah, LOW);
  digitalWrite(kuning, LOW);
  digitalWrite(hijau, LOW);
}

}