byte D1 = 2;
byte D2 = 3;
byte D3 = 4;
byte D4 = 5;

byte A = 6;
byte B = 7;
byte C = 8;
byte D = 9;
byte E = 10;
byte F = 11;
byte G = 12;
byte DP = 13; // decimal point

int timer = 1000;

int tbn = 1;
int tbdn = 1;

// Define the input pins for the 7-segment display segments.
const int segmentPins[] = {A, B, C, D, E, F, G, DP};

// Define the input pins for the 7-segment display digits.
const int digitPins[] = {D1, D2, D3, D4};

// For common cathode
uint8_t digitON = LOW;
uint8_t digitOFF = HIGH;

uint8_t segmentON = HIGH;
uint8_t segmentOFF = LOW;

void setup() {
   // Pin initialization.
   for (int i = 0; i < 8; i++) {
      pinMode(segmentPins[i], OUTPUT);
   }
   for (int i = 0; i < 4; i++) {
      pinMode(digitPins[i], OUTPUT);
      digitalWrite(digitPins[i], digitOFF);
   }
}

void resetdis(void)
{
    // reset

   // digits
   digitalWrite(D1, digitOFF);
   digitalWrite(D2, digitOFF);
   digitalWrite(D3, digitOFF);
   digitalWrite(D4, digitOFF);
   
   // segments
   digitalWrite(A, segmentOFF);
   digitalWrite(B, segmentOFF);
   digitalWrite(C, segmentOFF);
   digitalWrite(D, segmentOFF);
   digitalWrite(E, segmentOFF);
   digitalWrite(F, segmentOFF);
   digitalWrite(G, segmentOFF);
   digitalWrite(DP, segmentOFF);
}

// digits

void d1(void)
{
  digitalWrite(D1, digitON);
}


void d2(void)
{
  digitalWrite(D2, digitON);
}


void d3(void)
{
  digitalWrite(D3, digitON);
}


void d4(void)
{
  digitalWrite(D4, digitON);
}

void dall(void)
{
  digitalWrite(D1, digitON);
  digitalWrite(D2, digitON);
  digitalWrite(D3, digitON);
  digitalWrite(D4, digitON);
}

//segments

void dis1(void)
{
   digitalWrite(B, segmentON);
   digitalWrite(C, segmentON);
}

void dis2(void)
{
   digitalWrite(A, segmentON);
   digitalWrite(B, segmentON);
   digitalWrite(G, segmentON);
   digitalWrite(E, segmentON);
   digitalWrite(D, segmentON);
}


void dis3(void)
{
   digitalWrite(A, segmentON);
   digitalWrite(B, segmentON);
   digitalWrite(C, segmentON);
   digitalWrite(D, segmentON);
   digitalWrite(G, segmentON);
}


void dis4(void)
{
   digitalWrite(B, segmentON);
   digitalWrite(C, segmentON);
   digitalWrite(F, segmentON);
   digitalWrite(G, segmentON);
}


void dis5(void)
{
   digitalWrite(A, segmentON);
   digitalWrite(B, segmentON);
   digitalWrite(G, segmentON);
   digitalWrite(E, segmentON);
   digitalWrite(D, segmentON);
}


void dis6(void)
{
   digitalWrite(A, segmentON);
   digitalWrite(F, segmentON);
   digitalWrite(E, segmentON);
   digitalWrite(D, segmentON);
   digitalWrite(C, segmentON);
   digitalWrite(G, segmentON);
}


void dis7(void)
{
   digitalWrite(A, segmentON);
   digitalWrite(B, segmentON);
   digitalWrite(C, segmentON);
}


void dis8(void)
{
   digitalWrite(A, segmentON);
   digitalWrite(B, segmentON);
   digitalWrite(C, segmentON);
   digitalWrite(D, segmentON);
   digitalWrite(E, segmentON);
   digitalWrite(F, segmentON);
   digitalWrite(G, segmentON);
}


void dis9(void)
{
   digitalWrite(G, segmentON);
   digitalWrite(F, segmentON);
   digitalWrite(A, segmentON);
   digitalWrite(B, segmentON);
   digitalWrite(C, segmentON);
   digitalWrite(D, segmentON);
}

void dis0(void)
{
  digitalWrite(A, segmentON);
  digitalWrite(B, segmentON);
  digitalWrite(C, segmentON);
  digitalWrite(D, segmentON);
  digitalWrite(E, segmentON);
  digitalWrite(F, segmentON);
}



void disdp(void)
{
   digitalWrite(DP, segmentON);
}



void loop() {
  //   digitalWrite(D1, digitON);
  //   digitalWrite(C, segmentON); 
  // digits
   digitalWrite(D1, digitON);
   digitalWrite(D2, digitON);
   digitalWrite(D3, digitON);
   digitalWrite(D4, digitON);
   
   // segments
   digitalWrite(A, segmentON);
   delay(1000);
   digitalWrite(B, segmentON);
   delay(1000);
   digitalWrite(C, segmentON);
   delay(1000);
   digitalWrite(D, segmentON);
   delay(1000);
   digitalWrite(E, segmentON);
   delay(1000);
   digitalWrite(F, segmentON);
   delay(1000);
   digitalWrite(G, segmentON);
   delay(1000);
   digitalWrite(DP, segmentON);
   delay(1000);
  
}