int disp_pin[7];    // array for a-g pins of 7-Segment display
// set1 light
int ledred1 = 13;
int ledyellow1 = 5;
int ledgreen1 = 4;
// timer to switch go/stop
int led[3] = {3, 2, A0};

void define_segment_pins(int a, int b, int c, int d, int e, int f, int g)    // Assigns 7-segment display pins to board
{
  disp_pin[0] = a;
  disp_pin[1] = b;
  disp_pin[2] = c;
  disp_pin[3] = d;
  disp_pin[4] = e;
  disp_pin[5] = f;
  disp_pin[6] = g;
}

void display_number(int num)    // Function for displaying number (0-9)
{
  switch (num)
  {
    case 0:
      digitalWrite(disp_pin[0], LOW);    
      digitalWrite(disp_pin[1], LOW);    
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 1:
      digitalWrite(disp_pin[0], HIGH);    
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], HIGH);    
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 2:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 3:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 4:
      digitalWrite(disp_pin[0], HIGH);
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 5:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 6:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 7:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 8:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 9:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], LOW);
      break;
    default:
      digitalWrite(disp_pin[0], HIGH);
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], LOW);
      break;
  }
}

void setup() {
  pinMode(ledred1, OUTPUT);
  pinMode(ledyellow1, OUTPUT);
  pinMode(ledgreen1, OUTPUT);
  for (int i = 0; i < 3; i++) {
    pinMode(led[i], OUTPUT);
  }

  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  define_segment_pins(12, 11, 10, 9, 8, 7, 6);    // a-g segment pins to Arduino
}

void loop() {
  int i;
  for (i = 9; i >= 0; i--) {
    display_number(i);
    
     digitalWrite(ledgreen1, HIGH);
  delay(1000);
  }
 
  digitalWrite(ledgreen1, LOW);
  delay(1000);

  for (i = 0; i < 3; i++) {
    digitalWrite(led[i], HIGH);
    delay(500);
    digitalWrite(led[i], LOW);
    delay(500);
  }
    digitalWrite(ledyellow1, HIGH);
    delay(1000);
    digitalWrite(ledyellow1, LOW);
    delay(100);

  for (i = 0; i <= 9; i++) {
    display_number(i);
    delay(1000);
    digitalWrite(ledred1, HIGH);
  }
  digitalWrite(ledred1, LOW);


  for (i = 0; i < 3; i++) {
    digitalWrite(led[i], HIGH);
    delay(500);
    digitalWrite(led[i], LOW);
    delay(500);
  }
    digitalWrite(ledyellow1, HIGH);
    delay(1000);
    digitalWrite(ledyellow1, LOW);
    delay(100);
}