// by Nissanka MD Weerasinghe SLCOTM
// this has trick to remove visibility of tuning off of some segments
// when display number change.

void setup() {
 for(int i = 2; i<9;i++)
 {
  pinMode(i, OUTPUT);
  //digitalWrite(i, HIGH);
  //delay(200);
 }

 pinMode(13, OUTPUT);

 //delay(1500);
/*
  for(int i = 2; i<9;i++)
 {

  digitalWrite(i, 0);
 }

*/


}

void loop() {
SSD0();
delay(1000);

SSD1();
delay(1000);

SSD2();
delay(1000);

SSD3();
delay(1000);

SSD4();
delay(1000);

SSD5();
delay(1000);

SSD6();
delay(1000);

SSD7();
delay(1000);

SSD8();
delay(1000);

SSD9();
delay(1000);



/*


*/
}

void clear()
{
    //erase display (turn off All segments) and turn off display by common line
  for(int i = 2; i<9;i++) digitalWrite(i, 0);
  digitalWrite(13, 1); // turn SSD off
}

void SSD_on()
{
  delay(50); // only for wokwi simulation
  digitalWrite(13, 0);
}


void All()
{
  for(int i = 2; i<9;i++)
 {

  digitalWrite(i, 1);
 }

}

void SSD0()   // Display 1
{

  clear();
  All();
  digitalWrite(8,0);
  SSD_on();

}


void SSD1()   // Display 1
{

  clear();
  digitalWrite(3,1);
  digitalWrite(4,1);
  SSD_on();

}

void SSD2()   // Display 2
{

  clear(); 
  All();
  digitalWrite(4,0);
  digitalWrite(7,0);
  SSD_on();

}


void SSD3()
{

  clear(); 
  All();
  digitalWrite(6,0);
  digitalWrite(7,0);
  SSD_on();

}

void SSD4()
{

  clear(); 
  All();
  digitalWrite(2,0);
  digitalWrite(5,0);
  digitalWrite(6,0);
  SSD_on();

}

void SSD5()
{

  clear(); 
  All();
  digitalWrite(3,0);
  digitalWrite(6,0);
  SSD_on();

}

void SSD6()
{

  clear(); 
  All();
  digitalWrite(3,0);
  SSD_on();

}

void SSD7()
{

  clear(); 
  digitalWrite(2,1);
  digitalWrite(3,1);
  digitalWrite(4,1);
  SSD_on();

}

void SSD8()
{

  clear(); 
  All();
  SSD_on();

}

void SSD9()
{

  clear(); 
  All();
  digitalWrite(6,0);
  SSD_on();

}