//wiring and display programme for this 3.1 digit display
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//Define Segment Pins
#define IN1 12
#define IN2 13

#define d1B1 0
#define E2C1 1
#define G2B2 2
#define D2C2 3
#define F2A2 4
#define B3G3 5
#define A3F3 6
#define C3D3 7
#define E4E3 8
#define G4B4 9
#define D4C4 10
#define F4A4 11

void setup() {
pinMode(IN1,OUTPUT);
pinMode(IN2,OUTPUT);
pinMode(d1B1,OUTPUT);
pinMode(E2C1,OUTPUT);
pinMode(G2B2,OUTPUT);
pinMode(D2C2,OUTPUT);
pinMode(F2A2,OUTPUT);
pinMode(B3G3,OUTPUT);
pinMode(A3F3,OUTPUT);
pinMode(C3D3,OUTPUT);
pinMode(E4E3,OUTPUT);
pinMode(G4B4,OUTPUT);
pinMode(D4C4,OUTPUT);
pinMode(F4A4,OUTPUT);

//start with everything off
digitalWrite(IN1,LOW);
digitalWrite(IN2,LOW);
digitalWrite(d1B1,HIGH);
digitalWrite(E2C1,HIGH);
digitalWrite(G2B2,HIGH);
digitalWrite(D2C2,HIGH);
digitalWrite(F2A2,HIGH);
digitalWrite(B3G3,HIGH);
digitalWrite(A3F3,HIGH);
digitalWrite(C3D3,HIGH);
digitalWrite(E4E3,HIGH);
digitalWrite(G4B4,HIGH);
digitalWrite(D4C4,HIGH);
digitalWrite(F4A4,HIGH);
}
void loop() {
int DISP = (millis()/1000);
//string for extracting each digit of int DISP (e.g 1234 to 1,2,3,4)
int DIG1 = (DISP/1000U)%10;// "1---"
int DIG2 = (DISP/100U)%10;// "-2--"
int DIG3 = (DISP/10U)%10;// "--3-"
int DIG4 = (DISP/1U)%10;// "---4"

//Phase 1
  digitalWrite(IN1,HIGH);
  digitalWrite(IN2,LOW);

  switch (DIG2) 
    {
    case 0:
      if(DISP > 99){
      digitalWrite(E2C1,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);}
      break;
    case 2:
      digitalWrite(E2C1,LOW);
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      break;
    case 3:
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      break;
    case 4:
      digitalWrite(G2B2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 5:
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 6:    
      digitalWrite(E2C1,LOW);
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 8:    
      digitalWrite(E2C1,LOW);
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 9:      
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    }
  switch (DIG3) 
    {
    case 0:
      if(DISP > 9){
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);}
      break;
    case 1:
      digitalWrite(B3G3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 2:
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      break;
    case 3:
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 4:
      digitalWrite(B3G3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 5:
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 6:
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 7:
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
    case 8:
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 9:
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    }
  switch (DIG4) 
    {
    case 0:
      if(DISP > 0){
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      digitalWrite(E4E3,LOW);}
      break;
    case 2:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(E4E3,LOW);
      break;
    case 3:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      break;
    case 4:
      digitalWrite(G4B4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 5:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 6:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      digitalWrite(E4E3,LOW);
      break;
    case 8:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      digitalWrite(E4E3,LOW);
      break;
    case 9:      
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    }
  //clear phase 1
  digitalWrite(d1B1,HIGH);
  digitalWrite(E2C1,HIGH);
  digitalWrite(G2B2,HIGH);
  digitalWrite(D2C2,HIGH);
  digitalWrite(F2A2,HIGH);
  digitalWrite(B3G3,HIGH);
  digitalWrite(A3F3,HIGH);
  digitalWrite(C3D3,HIGH);
  digitalWrite(E4E3,HIGH);
  digitalWrite(G4B4,HIGH);
  digitalWrite(D4C4,HIGH);
  digitalWrite(F4A4,HIGH);

//phase 2
  digitalWrite(IN1,LOW);
  digitalWrite(IN2,HIGH);
  switch (DIG1)
    {
    case 1:
      digitalWrite(d1B1,LOW);
      digitalWrite(E2C1,LOW);
      break;
    }
  switch (DIG2) 
    {
    case 0:
      if(DISP > 99){
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);}
      break;
    case 1:
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      break;
    case 2:
      digitalWrite(G2B2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 3:
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 4:
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      break;
    case 5:
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 6:
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 7:
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 8:
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    case 9:      
      digitalWrite(G2B2,LOW);
      digitalWrite(D2C2,LOW);
      digitalWrite(F2A2,LOW);
      break;
    }
  switch (DIG3) 
    {
    case 0:
      if(DISP > 9){
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      digitalWrite(E4E3,LOW);}
      break;
    case 2:
      digitalWrite(B3G3,LOW);
      digitalWrite(C3D3,LOW);
      digitalWrite(E4E3,LOW);
      break;
    case 3:
      digitalWrite(B3G3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 4:
      digitalWrite(A3F3,LOW);
      digitalWrite(B3G3,LOW);
      break;
    case 5:
      digitalWrite(A3F3,LOW);
      digitalWrite(B3G3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    case 6:
      digitalWrite(A3F3,LOW);
      digitalWrite(B3G3,LOW);
      digitalWrite(C3D3,LOW);
      digitalWrite(E4E3,LOW);
      break;
    case 8:
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      digitalWrite(E4E3,LOW);
      break;
    case 9:
      digitalWrite(B3G3,LOW);
      digitalWrite(A3F3,LOW);
      digitalWrite(C3D3,LOW);
      break;
    }
  switch (DIG4) 
    {
    case 0:
      if(DISP > 0){
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);}
      break;
    case 1:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      break;
    case 2:
      digitalWrite(G4B4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 3:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 4:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      break;
    case 5:
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 6:
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 7:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 8:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    case 9:
      digitalWrite(G4B4,LOW);
      digitalWrite(D4C4,LOW);
      digitalWrite(F4A4,LOW);
      break;
    }


  //clear phase 1
  digitalWrite(d1B1,HIGH);
  digitalWrite(E2C1,HIGH);
  digitalWrite(G2B2,HIGH);
  digitalWrite(D2C2,HIGH);
  digitalWrite(F2A2,HIGH);
  digitalWrite(B3G3,HIGH);
  digitalWrite(A3F3,HIGH);
  digitalWrite(C3D3,HIGH);
  digitalWrite(E4E3,HIGH);
  digitalWrite(G4B4,HIGH);
  digitalWrite(D4C4,HIGH);
  digitalWrite(F4A4,HIGH);
}