//Pendefinisian Pin
#define A 18
#define B 23
#define C 25
#define D 27
#define E 14
#define F 19
#define G 33
#define DP 26

#define DIG1 5
#define DIG2 21
#define DIG3 22
#define DIG4 32

#define BTN 13

#define DIR 0
#define STEP 4

const uint8_t LEDS[] = {A,B,C,D,E,F,G};
const uint8_t DIGS[] = {DIG1,DIG2,DIG3,DIG4};

//Fungsi ini menyalakan atau mematikan segmen LED untuk menampilkan angka tertentu pada 7-segment display.
void Segment(uint8_t num) {
  switch (num)
  {
    case 0 :
      digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, LOW);
    break;
    case 1 :
      digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
  break;
    case 2 :
      digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, LOW);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, LOW);
      digitalWrite(G, HIGH);
  break;
    case 3 :
      digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, HIGH);
   break;
    case 4 :
      digitalWrite(A, LOW);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
   break;
    case 5 :
      digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
    break;
    case 6 :
      digitalWrite(A, HIGH);
      digitalWrite(B, LOW);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
    break;
    case 7 :
      digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
    break;
    case 8 :
      digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, HIGH);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
    break;
    case 9 :
      digitalWrite(A, HIGH);
      digitalWrite(B, HIGH);
      digitalWrite(C, HIGH);
      digitalWrite(D, HIGH);
      digitalWrite(E, LOW);
      digitalWrite(F, HIGH);
      digitalWrite(G, HIGH);
    break;
    case 10 : //OFF
      digitalWrite(A, LOW);
      digitalWrite(B, LOW);
      digitalWrite(C, LOW);
      digitalWrite(D, LOW);
      digitalWrite(E, LOW);
      digitalWrite(F, LOW);
      digitalWrite(G, LOW);
    break;
  }
}

//Fungsi ini mengontrol digit mana yang akan aktif pada 7-segment display.
void Digits(uint8_t scan){
  switch (scan)
  {
    case 0: 
      digitalWrite(DIG1,HIGH);
      digitalWrite(DIG2,HIGH);
      digitalWrite(DIG3,HIGH);
      digitalWrite(DIG4,HIGH);
    break;
    case 1: 
      digitalWrite(DIG1,LOW);
      digitalWrite(DIG2,HIGH);
      digitalWrite(DIG3,HIGH);
      digitalWrite(DIG4,HIGH);
    break;
    case 2: 
      digitalWrite(DIG1,HIGH);
      digitalWrite(DIG2,LOW);
      digitalWrite(DIG3,HIGH);
      digitalWrite(DIG4,HIGH);
    break;
    case 3: 
      digitalWrite(DIG1,HIGH);
      digitalWrite(DIG2,HIGH);
      digitalWrite(DIG3,LOW);
      digitalWrite(DIG4,HIGH);
    break;
    case 4: 
      digitalWrite(DIG1,HIGH);
      digitalWrite(DIG2,HIGH);
      digitalWrite(DIG3,HIGH);
      digitalWrite(DIG4,LOW);
    break;
  }
}

uint8_t Display_buffer[] = {0,0,0,0};
void Display(void) {
  for (uint8_t n = 0; n < 4; n++) { // Iterasi untuk setiap digit
    Segment(10); // Matikan semua segmen
    digitalWrite(DP, LOW); // Matikan titik desimal
    Digits(n + 1); // Pilih digit
    Segment(Display_buffer[n]); // Tampilkan angka pada digit
    if (n == 1) // Hidupkan titik desimal di digit kedua
      digitalWrite(DP, HIGH);
    delay(10); // Tunggu sebentar untuk stabilitas tampilan
  }
}

void setup() {
  for (uint8_t n = 0; n < 7; n++)
    pinMode(LEDS[n], OUTPUT); // Segmen LED menjadi output
  for (uint8_t n = 0; n < 4; n++)
    pinMode(DIGS[n], OUTPUT); // Digit menjadi output
  pinMode(DP, OUTPUT); // Titik desimal menjadi output

  pinMode(BTN, INPUT); // Tombol sebagai input
  pinMode(DIR, OUTPUT); // Arah motor stepper sebagai output
  pinMode(STEP, OUTPUT); // Pulsa motor stepper sebagai output

  digitalWrite(DIG1, LOW); // Matikan semua digit
  digitalWrite(DIG2, LOW);
  digitalWrite(DIG3, LOW);
  digitalWrite(DIG4, LOW);
  Segment(0); // Mulai dari angka 0
}

const uint16_t Max_step =500;
int16_t step = 500;
void loop() {
  if (digitalRead(BTN) == LOW) { // Jika tombol ditekan
    if (step > 0) { // Jika langkah masih tersisa
      digitalWrite(STEP, HIGH); // Kirim pulsa untuk motor stepper
      delay(10);
      digitalWrite(STEP, LOW);
      step--; // Kurangi langkah
    }
  } else {
    step = Max_step; // Reset langkah ke nilai maksimum jika tombol dilepas
  }

  // Perbarui buffer untuk ditampilkan
  Display_buffer[0] = step / 1000; // Ribuan
  Display_buffer[1] = step / 100 % 10; // Ratusan
  Display_buffer[2] = step / 10 % 10; // Puluhan
  Display_buffer[3] = step % 10; // Satuan
  Display(); // Perbarui tampilan
  delay(10); // Penundaan untuk stabilitas
}