int segA = 1;
int segB = 2;
int segC = 3;
int segD = 4;
int segE = 5;
int segF = 6;
int segG = 7;
int merah = 8;
int hijau = 9;  
int button = 10;
int angka = 0;

void setup() {
  pinMode(segA, OUTPUT);
  pinMode(segB, OUTPUT);
  pinMode(segC, OUTPUT);
  pinMode(segD, OUTPUT);
  pinMode(segE, OUTPUT);
  pinMode(segF, OUTPUT);
  pinMode(segG, OUTPUT);
  pinMode(merah, OUTPUT);
  pinMode(hijau, OUTPUT);

  // button ditekan, pin otomatis nyambungin ke GND
  pinMode(button, INPUT_PULLUP);

  digitalWrite(merah, HIGH);
  digitalWrite(hijau, LOW);

  tampilangka(angka);
}

void loop() {
  
  if (digitalRead(button) == LOW) {
    digitalWrite(merah, LOW);
    digitalWrite(hijau, HIGH);

    angka++;
    if (angka > 9) angka = 0;
    tampilangka(angka);
    delay(800);

  } else {
    digitalWrite(hijau, LOW);
    digitalWrite(merah, HIGH);
  }
}

void tampilangka(int digit) {
  digitalWrite(segA, LOW);
  digitalWrite(segB, LOW);
  digitalWrite(segC, LOW);
  digitalWrite(segD, LOW);
  digitalWrite(segE, LOW);
  digitalWrite(segF, LOW);
  digitalWrite(segG, LOW);

  // angka muncul dari 0-9
  if (digit == 0) {
    digitalWrite(segA, HIGH);
    digitalWrite(segB, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segD, HIGH);
    digitalWrite(segE, HIGH);
    digitalWrite(segF, HIGH);
  }
  else if (digit == 1) {
    digitalWrite(segB, HIGH);
    digitalWrite(segC, HIGH);
  }
  else if (digit == 2) {
    digitalWrite(segA, HIGH);
    digitalWrite(segB, HIGH);
    digitalWrite(segG, HIGH);
    digitalWrite(segE, HIGH);
    digitalWrite(segD, HIGH);
  }
  else if (digit == 3) {
    digitalWrite(segA, HIGH);
    digitalWrite(segB, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segD, HIGH);
    digitalWrite(segG, HIGH);
  }
  else if (digit == 4) {
    digitalWrite(segB, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segF, HIGH);
    digitalWrite(segG, HIGH);
  }
  else if (digit == 5) {
    digitalWrite(segA, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segD, HIGH);
    digitalWrite(segF, HIGH);
    digitalWrite(segG, HIGH);
  }
  else if (digit == 6) {
    digitalWrite(segA, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segD, HIGH);
    digitalWrite(segE, HIGH);
    digitalWrite(segF, HIGH);
    digitalWrite(segG, HIGH);
  }
  else if (digit == 7) {
    digitalWrite(segA, HIGH);
    digitalWrite(segB, HIGH);
    digitalWrite(segC, HIGH);
  }
  else if (digit == 8) {
    digitalWrite(segA, HIGH);
    digitalWrite(segB, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segD, HIGH);
    digitalWrite(segE, HIGH);
    digitalWrite(segF, HIGH);
    digitalWrite(segG, HIGH);
  }
  else if (digit == 9) {
    digitalWrite(segA, HIGH);
    digitalWrite(segB, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segD, HIGH);
    digitalWrite(segF, HIGH);
    digitalWrite(segG, HIGH);
  }
}