void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(2, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(15, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(19, OUTPUT);
  pinMode(21, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
   // this speeds up the simulation
  for(int i=6;i<13;i++)
  {
    digitalWrite(i, LOW);
    delay(500);
  }
  for(int i=6;i<13;i++)
  {
    digitalWrite(i, HIGH);
    delay(500);
  }
  delay(1000);
}
/*
void loop()
{
  //0
  num(0,0,0,0,0,0,1);
  delay(1000);
  //1
  num(1,0,0,1,1,1,1);
  delay(1000);
  //2
  num(0,0,1,0,0,1,0);
  delay(1000);
  //3
  num(0,0,0,0,1,1,0);
  delay(1000);
  //4
  num(1,0,0,1,1,0,0)
  delay(1000);
  //5
  num(0,1,0,0,1,0,0);
  delay(1000);
  //6
  num(0,1,0,0,0,0,0);
  delay(1000);
  //7
  num(0,0,0,1,1,1,1);
  delay(1000);
  //8
  num(0,0,0,0,0,0,0);
  delay(1000);
  //9
  num(0,0,0,0,1,0,0);
  delay(1000);
}
*/
void num(int a,int b,int c,int d,int e,int f,int g);
{
  digitalWrite(2,a);
  digitalWrite(4,b);
  digitalWrite(5,c);
  digitalWrite(15,d);
  digitalWrite(18,e);
  digitalWrite(19,f);
  digitalWrite(21,g);
}