int ledb = 10 ;
int ledk = 11 ;
int ledo = 12 ;
int ledm = 13 ;

const int trigpin = 6;
const int echopin = 5;
long timer;
int jarak;


void setup() {

Serial.begin(9600);
pinMode(ledb, OUTPUT);
pinMode(ledk, OUTPUT);
pinMode(ledo, OUTPUT);
pinMode(ledm, OUTPUT);
pinMode(trigpin, OUTPUT);
pinMode(echopin, INPUT);
}

void loop() {


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 > 150 ){
  digitalWrite(ledb,LOW);
}
else{
  digitalWrite(ledb, HIGH);
}

if(jarak > 100 ){
  digitalWrite(ledk,LOW);
}
else{
  digitalWrite(ledk, HIGH);
}
if(jarak > 50 ){
  digitalWrite(ledo,LOW);
}
else{
  digitalWrite(ledo, HIGH);
}
if(jarak > 20 ){
  digitalWrite(ledm,LOW);
}
else{
  digitalWrite(ledm, HIGH);
}

  }