int count1 = 0;
int count2 = 0;
int led[7] = {19, 18, 5, 17, 16, 4, 0};
int numbers[10][7] = {
  1, 1, 1, 1, 1, 1, 0, //0
  0, 1, 1, 0, 0, 0, 0, //1
  1, 1, 0, 1, 1, 0, 1, //2
  1, 1, 1, 1, 0, 0, 1, //3
  0, 1, 1, 0, 0, 1, 1, //4
  1, 0, 1, 1, 0, 1, 1, //5
  1, 0, 1, 1, 1, 1, 1, //6
  1, 1, 1, 0, 0, 0, 0, //7
  1, 1, 1, 1, 1, 1, 1, //8
  1, 1, 1, 1, 0, 1, 1, //9
};
void setup() {
  Serial.begin(115200);
  Serial.println("Hello");
  for (int i = 0; i < 7; i++) {
    pinMode(led[i], OUTPUT);
  }
}
void loop() {}
void serialEvent() {
  while (Serial.available()) {
    char ch = Serial.read();
    Serial.print(ch);
    if (ch == '1') {
      count1++;
      print_number(count1);
    }
    else if (ch == '2') {
      count1--;
      print_number(count1);
    }
  }
}
void print_number (int num) {
  for (int i = 0; i < 7; i++) {
      digitalWrite(led[i], LOW);
    }
  for (int i = 0; i < 7; i++) {
    if (numbers[num][i] == 1) {
      digitalWrite(led[i], HIGH);
    }
    else {
      digitalWrite(led[i], LOW);
    }
  }
}