//SSD is Seven-Segment Display

int signal1[] = {46, 45, 44};
int signal2[] = {43, 42, 41};
int signal3[] = {40, 39, 38};
int signal4[] = {47, 48, 49};

int redDelay = 5000;
int yellowDelay = 2000;

#define START 50
#define STOP  51


#define LED1 22
#define LED2 23

/*


#define LED3 24
#define LED4 25
#define LED5 26
#define LED6 27
#define LED7 28
#define LED8 29
#define LED9 30
#define LED10 31
#define LED11 32
#define LED12 33
#define LED13 34
#define LED14 35
#define LED15 36 
#define LED16 37
#define LED17 38
#define LED18 39
#define LED19 40
#define LED20 41
#define LED21 42 
#define LED22 43 
#define LED23 44
#define LED24 45
#define LED25 46
#define LED26 47
#define LED27 48
#define LED28 49
*/

void setup()
{

  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(START, INPUT);


  for (int i = 0; i < 3; i++) {
    pinMode(signal1[i], OUTPUT);
    pinMode(signal2[i], OUTPUT);
    pinMode(signal3[i], OUTPUT);
    pinMode(signal4[i], OUTPUT);
  }

  for (int i = 0; i <= 13; i++)
    pinMode(i, OUTPUT); //Set all pins from 0 to 13 as OUTPUT


}
//The line below is the array containing all the binary numbers for the digits on a SSD from 0 to 9
const int number[11] = {0b1000000, 0b1111001, 0b0100100, 0b0110000, 0b0011001, 0b0010010, 0b0000010, 0b1111000, 0b0000000, 0b0010000};



void loop()
{

  if(digitalRead(START) == HIGH)
  {

    digitalWrite(digitalRead(LED1), HIGH);
    digitalWrite(digitalRead(LED2), HIGH);
    
  }

  else
  {

    digitalWrite(digitalRead(LED1), HIGH);
    digitalWrite(digitalRead(LED2), LOW);
       
  }

}

void display_tens(const int tens)
{
  int pin1, a, ones;     
  //pin1 is just used to deal with pins of the 1st SSD which desplays the tens digit

  for (pin1 = 0, a = 0; pin1 < 7; pin1++, a++)
  {
    digitalWrite(pin1, bitRead(number[tens], a));
  }


  for (ones = 9; ones > -1; ones--)
  {
    display_ones(ones);
    delay(1000); 
    //I have given a delay of 300 milliseconds. You can put your own Time!!
  }

}

void display_ones(const int x)
{ int pin2, b;             
//pin2 is just used to deal with pins of the 2nd SSD which desplays the ones digit

  for (pin2 = 7, b = 0; pin2 <= 13; pin2++, b++)
  {
    digitalWrite(pin2, bitRead(number[x], b));
  }

}