#define echoPin 2
#define trigPin 3 
int maximumRange = 300;
int minimumRange = 00;
long duration,distance;

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

}

void loop() {
  // penentuan jarak:
  digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin,HIGH);

distance = duration/58.2;

if (distance >= maximumRange || distance <= minimumRange){
  Serial.println("Di luar jangkauan");
}
else{

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

  delay(100);

}
if(distance <= 100){
  digitalWrite(11, HIGH);
  digitalWrite(10, LOW);
  digitalWrite(9, LOW);
}
if(distance > 100 && distance < 200){
  digitalWrite(11, LOW);
  digitalWrite(10, HIGH);
  digitalWrite(9, LOW);
}
if(distance >=200){
  digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  digitalWrite(9, HIGH);
}
}