#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);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(8, OUTPUT);
}

void loop() {
  /* penentuan jarak. */
  digitalWrite(trigpin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
digitalWrite(trigpin, LOW);
duration = pulseIn(echopin, HIGH);


//perhitungan untuk dijadikan jarak
distance = duration/58.2;

/*jika jarak melebihi 300 cm,
kirim keterangan "Di luar jangkauan" */

if (distance >= maximumrange || distance <= minimumrange){

  Serial.println("Di luar jangkauan");
}


else {

  /*
  kirim hasil pembacaan jarak melalui serial monitor
  */
  Serial.print("Jarak : ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(100);
}

if(distance <= 100){
  digitalWrite(11, HIGH);
  digitalWrite(10, LOW);
  digitalWrite(9, LOW);
  digitalWrite(8, LOW);
}
  if(distance > 100 && distance < 200){
    digitalWrite(11, LOW);
  digitalWrite(10, HIGH);
  digitalWrite(9, LOW);
  digitalWrite(8, HIGH);
}
if(distance >200 && distance < 300){
    digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  digitalWrite(9, HIGH);
  digitalWrite(8, LOW);
}
if(distance > 300){
    digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  digitalWrite(9, LOW);
  digitalWrite(8, LOW);
}
}