int ledk = 11;
int ledo = 12;
int ledm = 13;

const int trigpin = 10;
const int echopin = 9;
long timer;
int jarak;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(ledk, OUTPUT);
  pinMode(ledo, OUTPUT);
  pinMode(ledm, OUTPUT);
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigpin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigpin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigpin, LOW);

  timer = pulseIn(echopin, HIGH);
  jarak = timer/58;
  Serial.println(jarak);
  delay(200);

  if(jarak > 200){
    digitalWrite(ledk, LOW);
  }else{
    digitalWrite(ledk, HIGH);
  }

  if(jarak > 100){
    digitalWrite(ledo, LOW);
  }else{
    digitalWrite(ledo, HIGH);
  }

  if(jarak > 50){
    digitalWrite(ledm, LOW);
  }else{
    digitalWrite(ledm, HIGH);
  }

}