#define echopin 5 
#define TRIG 4
#define led_M 9
#define LED_K 7
#define LED_H 6

void setup() {

  // put your setup code here, to run once: 
    pinMode(echopin,INPUT);
    pinMode(TRIG, OUTPUT);
    pinMode(led_M, OUTPUT);
    pinMode(LED_K, OUTPUT);
    pinMode(LED_H, OUTPUT);


}

void loop() {
  // put your main code here, to run repeatedly
  digitalWrite(TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG, LOW);
  int durasi = pulseIn(echopin, HIGH);
  float tinggi = (durasi / 2) / 29.25;

  if(tinggi <= 50) {
    digitalWrite(led_M, LOW);
    digitalWrite( LED_K, LOW);
    digitalWrite(LED_H, HIGH);
  }else if(tinggi >=51 && tinggi<=100) {
    digitalWrite(led_M, LOW);
    digitalWrite( LED_K, HIGH);
    digitalWrite(LED_H, LOW);
  }else{
    digitalWrite(led_M, HIGH);
    digitalWrite( LED_K, LOW);
    digitalWrite(LED_H, LOW);
  }



}