// MUHAMMAD FA'IZ DWI ADHISKI
// XI TEK 1

// === PTS SEMESTER 2 ===

#define TRIG 19
#define ECHO 18

#define SOUND 0.034
#define LED 4

#define minCenti 10

namespace PTS_FAIZ {
  void begi() {
    Serial.begin(9600);

    pinMode(TRIG, OUTPUT);
    pinMode(ECHO, INPUT);
    pinMode(LED, OUTPUT);
  }

  int measure() {
    digitalWrite(TRIG, LOW);
    delayMicroseconds(10);
    digitalWrite(TRIG, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG, LOW);
    delayMicroseconds(10);

    const int jar = pulseIn(ECHO, HIGH);
    const int meas = ((jar * SOUND) / 2) + 1;

    return meas;
  }

  void main() {
    Serial.println(measure());

    if(measure() <= minCenti) {
      digitalWrite(LED, HIGH);
    } else {
      digitalWrite(LED, LOW);
    }
  }
}

void setup() {
  PTS_FAIZ::begi();
}

void loop() {
  PTS_FAIZ::main();
}