int segA = 2, segB = 3, segC = 4, segD = 5, segE = 6, segF = 7, segG = 8, merah = 9;

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);
  Serial.begin(9600);
  
  matikanSevenSeg();
  digitalWrite(merah, LOW);
}

void loop() {
  Serial.println("angka berapa?");
  while(Serial.available() == 0){}
  int n = Serial.parseInt();
  Serial.read();
  
  tampilangka(n);
  
  if (n > 9) {
    Serial.println("Input lebih dari 9, LED menyala!");
    digitalWrite(merah, HIGH);
  } else {
    digitalWrite(merah, LOW);
    for(int i = 0; i < n; i++) {
      Serial.print("Jumlah: ");
      Serial.println(i+1);
      delay(1000);
    }
  }
  
  Serial.print("Input angka: ");
  Serial.println(n);
  delay(2000);
}

void matikanSevenSeg() {
  digitalWrite(segA, LOW);
  digitalWrite(segB, LOW);
  digitalWrite(segC, LOW);
  digitalWrite(segD, LOW);
  digitalWrite(segE, LOW);
  digitalWrite(segF, LOW);
  digitalWrite(segG, LOW);
}

void tampilangka(int digit) {
  matikanSevenSeg();

  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(segG, HIGH);
    digitalWrite(segC, HIGH);
    digitalWrite(segD, 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);
  }
  else {
    digitalWrite(segG, HIGH);

  }
}