#define merah 1
#define kuning 2
#define trig 3
#define echo 4
#define hijau 5
#define buzzer 6
long waktu;
int jarak;
void setup(){
  pinMode(merah, OUTPUT);
  pinMode(kuning, OUTPUT);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(hijau, OUTPUT);
  pinMode(buzzer, OUTPUT);
}
void loop(){
  digitalWrite(trig, HIGH);
  delay(10);
  digitalWrite(trig, LOW);
  waktu = pulseIn(echo,HIGH);
  jarak = waktu * 0.034/2;

if(jarak<100){
  digitalWrite(merah, HIGH);
  tone(buzzer,1000);
  delay(100);
  digitalWrite(merah, LOW);
  noTone(buzzer);
  delay(100);
}else if(jarak<200){
  digitalWrite(kuning, HIGH);
  tone(buzzer,1000);
  delay(500);
  digitalWrite(kuning, LOW);
  noTone(buzzer);
  delay(500);
}else if(jarak<300){
  digitalWrite(hijau, HIGH);
  tone(buzzer,1000);
  delay(1000);
  digitalWrite(hijau, LOW);
  noTone(buzzer);
  delay(1000);
}
}