//=============================
// nama : Alfianus Gatu 
// nim  : 19102173
//=============================
// Mengukur jarak dengan sensor ultrasonik dengan LED sebagai indikator


#define ep 2
#define tp 15

int maksimal = 300;
int minimal = 00;
long jarak, durasi;

void setup() {
 
  Serial.begin(115200);
  pinMode(tp, OUTPUT);
  pinMode(ep, INPUT);

  pinMode(5, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(19, OUTPUT);
  
}
void loop(){
  digitalWrite(tp, LOW);
  delayMicroseconds(2);
  digitalWrite(tp, HIGH);
  delayMicroseconds(2);
  digitalWrite(tp, LOW);
  durasi = pulseIn(ep, HIGH);

  jarak = durasi/58.2;

  if (jarak >= maksimal || jarak <= minimal ){
  Serial.println("diluar jangkauan");
  }
  else {
    Serial.print("jarak :  ");
    Serial.print(durasi);
    Serial.println(" cm ");
    
    delay (100);
  }
  if (jarak <= 100){ // jika jarak kurang dari 100 led merah nyala
    digitalWrite(5, HIGH);
    digitalWrite(18, LOW);
    digitalWrite(19, LOW);
  }
  if (jarak > 100 && jarak <= 200 ){
    digitalWrite(18, HIGH); //jika jarak > 100 dan <= 200 led biru nyala
    digitalWrite(5, LOW);
    digitalWrite(19, LOW);
  }
   if (jarak > 200 ){

    digitalWrite(19, HIGH); //jika jarak lebih dari 200 led hijau nyala
    digitalWrite(18, LOW);
    digitalWrite(5, LOW);
    
  }
}