int ledPins[7] = {19, 18, 5, 17, 16, 4, 0};
const int seg_a = 19;
const int seg_b = 18;
const int seg_c = 5;
const int seg_d = 17;
const int seg_e = 16;
const int seg_f = 4;
const int seg_g = 0;
void setup()

{
  Serial.begin(115200);
  Serial.println("hello,ESP32!");
  pinMode(seg_a, OUTPUT);
  pinMode(seg_b, OUTPUT);
  pinMode(seg_c, OUTPUT);
  pinMode(seg_d, OUTPUT);
  pinMode(seg_e, OUTPUT);
  pinMode(seg_f, OUTPUT);
  pinMode(seg_g, OUTPUT);

}
void loop()
{
  for (int i = 0; i <=9; i++)
  {
    print_number(i);
    delay(1000);
  }
  for (int i = 9; i >=0; i--)
  {
    print_number(i);
    delay(1000);
  }


}
void print_number(int counter)
{

  if (counter == 0)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_c, HIGH);
    digitalWrite(seg_d, HIGH);
    digitalWrite(seg_e, HIGH);
    digitalWrite(seg_f, HIGH);
    //print 0 code
  }
  else if (counter == 1)
  {
    all_off();
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_c, HIGH);
    //print 1 code
  }
  else if (counter == 2)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_g, HIGH);
    digitalWrite(seg_e, HIGH);
    digitalWrite(seg_d, HIGH);
    //print 2 code
  }
  else if (counter == 3)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_c, HIGH);
    digitalWrite(seg_d, HIGH);
    digitalWrite(seg_g, HIGH);
  }
  else if (counter == 4)
  {
    all_off();
    digitalWrite(seg_f, HIGH);
    digitalWrite(seg_g, HIGH);
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_c, HIGH);
  }
  else if (counter == 5)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_f, HIGH);
    digitalWrite(seg_g, HIGH);
    digitalWrite(seg_c, HIGH);
    digitalWrite(seg_d, HIGH);
  }
  else if (counter == 6)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_c, HIGH);
    digitalWrite(seg_d, HIGH);
    digitalWrite(seg_e, HIGH);
    digitalWrite(seg_f, HIGH);
    digitalWrite(seg_g, HIGH);
  }
  else if (counter == 7)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_c, HIGH);
  }
  else if (counter == 8)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_c, HIGH);
    digitalWrite(seg_d, HIGH);
    digitalWrite(seg_e, HIGH);
    digitalWrite(seg_f, HIGH);
    digitalWrite(seg_g, HIGH);
  }
  else if (counter == 9)
  {
    all_off();
    digitalWrite(seg_a, HIGH);
    digitalWrite(seg_b, HIGH);
    digitalWrite(seg_c, HIGH);
    digitalWrite(seg_d, HIGH);
    digitalWrite(seg_f, HIGH);
    digitalWrite(seg_g, HIGH);
  }

}
void all_off()
{
  for (int i = 0; i < 7; i++)
  {
    digitalWrite(ledPins[i], LOW);
  }

}