#define pin_trig 7
#define pin_echo 6
#define led_m 13
#define led_j 12
#define led_b 11

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(pin_trig, OUTPUT);
  pinMode(pin_echo, INPUT);

}

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

  int duration = pulseIn(pin_echo, HIGH);
  Serial.print("Distance in CM: ");
  Serial.println(duration / 58);

int jarak = duration / 58;
if(jarak <= 10){
  digitalWrite(led_m, HIGH);
  digitalWrite(led_h, LOW);
  digitalWrite(led_b, LOW);
}else if (jarak > 10 && jarak < 20) {
  digitalWrite(led_m, LOW);
  digitalWrite(led_h, HIGH);
  digitalWrite(led_b, LOW);
}else{
  digitalWrite(led_m, LOW);
  digitalWrite(led_h, LOW);
  digitalWrite(led_b, HIGH);
}

}