#define echo 12
#define trig 13

const int pin_led[] = {2,3,4,5,6,7,8,9,10,11};
int squen_led = 10;

float mA, bar, bit_value;

void setup() {
  Serial.begin(9600);
  //deklarasi pin bar
  for(int i = 0;i <= 9; i++) {
    pinMode(pin_led[i], OUTPUT);
    digitalWrite(pin_led[i], HIGH);
    delay(50);
    }
  for(int i = 9; i >= 0; i--) {
    digitalWrite(pin_led[i], LOW);
    delay(50);
    }
  //deklarasi pin ultrasonik
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);

  //perhitungan scalling 3 bar



  //inisialisasi sistem
  Serial.println("------SISTEM DIAKTIFKAN------");
  delay(1000);
}

void loop() {
  int jarak = baca_jarakCM();
  jarak = map(jarak, 0, 401, 5, 0);  
  Serial.print("jarak: ");
  Serial.print(jarak); Serial.println(" meter");
  delay(100);
  int level_led = map(jarak, 0, 5, 0, squen_led);

  for(int i = 0; i < squen_led; i++) {
    if(i < level_led) {
      digitalWrite(pin_led[i], HIGH);
    }
    else {
      digitalWrite(pin_led[i], LOW);
    }
  }
}

int baca_jarakCM() {
  //transmit
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  //recieve
  int duration = pulseIn(echo, HIGH);
  return duration / 58;
}

//fungsi map menggunakan float agar pecahan bisa terlihat
float mapFloat(float x, float in_min, float in_max, float out_min, float out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}