int ledkuning = 11;
int ledtoska = 12;
int ledmerah = 13;
const int trigpin = 7;
const int echopin = 6;
long timer;
int jarak;


void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(ledkuning, OUTPUT);
pinMode(ledtoska, OUTPUT);
pinMode(ledmerah, 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(ledkuning, LOW);
}else{
  digitalWrite(ledkuning, HIGH);
}

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

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



}