#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] ={
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

uint8_t colPins[COLS] = {A2, A3, A4, A5};
uint8_t rowPins[ROWS] = {5, 4, 3, 2};

Keypad keypad =Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}



int disp_pin[7];  /* array for a-g pins of 7-Segment display */

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] = 7;
  disp_pin[1] = 8;
  disp_pin[2] = 9;
  disp_pin[3] = 10;
  disp_pin[4] = 11;
  disp_pin[5] = 12;
  disp_pin[6] = 13;
}

void display_number(int num) /* Function for displaying number (0-9) */
{
  pinMode(7, OUTPUT);  
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
  define_segment_pins(13, 12, 11, 10, 9, 8, 7); /* a-g segment pins to Arduino */
  
  switch(num)
  {
    case 0:
      digitalWrite(disp_pin[0], HIGH);  /* Drive disp_pin[0] to LOW */
      digitalWrite(disp_pin[1], HIGH); 
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], LOW); 
      break;
    case 1:
      digitalWrite(disp_pin[0], HIGH);  /* Drive disp_pin[0] to HIGH */
      digitalWrite(disp_pin[1], LOW);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], LOW); 
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 2:
      digitalWrite(disp_pin[0], HIGH);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], LOW);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 3:
      digitalWrite(disp_pin[0], HIGH);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 4:
      digitalWrite(disp_pin[0], HIGH);
      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], HIGH);
      break;
    case 5:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 6:
      digitalWrite(disp_pin[0], LOW);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 7:
      digitalWrite(disp_pin[0], HIGH);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], LOW);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], LOW);
      digitalWrite(disp_pin[6], LOW);
      break;
    case 8:
      digitalWrite(disp_pin[0], HIGH);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], HIGH);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], HIGH);
      break;
    case 9:
      digitalWrite(disp_pin[0], HIGH);
      digitalWrite(disp_pin[1], HIGH);
      digitalWrite(disp_pin[2], HIGH);
      digitalWrite(disp_pin[3], HIGH);
      digitalWrite(disp_pin[4], LOW);
      digitalWrite(disp_pin[5], HIGH);
      digitalWrite(disp_pin[6], HIGH);
      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;
    case 10:
      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;
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  
  char key = keypad.getKey();

  if (key != NO_KEY)
  {
    Serial.println(key);
  }
  
    int i;
    if (key == ('1'))
    
      for (i = 1; i >= 1; i--)
      display_number(i);

    if (key == ('2'))
    
      for (i = 2; i >= 2; i--)
      display_number(i);
    if (key == ('3'))
    
      for (i = 3; i >= 3; i--)
      display_number(i);
    if (key == ('4'))
    
      for (i = 4; i >= 4; i--)
      display_number(i);
    if (key == ('5'))
    
      for (i = 5; i >= 5; i--)
      display_number(i);
    if (key == ('6'))
    
    for (i = 6; i >= 6; i--)
    display_number(i);
    if (key == ('7'))
    
    for (i = 7; i >= 7; i--)
    display_number(i);
    if (key == ('8'))
    
    for (i = 8; i >= 8; i--)
    display_number(i);
    if (key == ('9'))
    
    for (i = 9; i >= 9; i--)
    display_number(i);
    if (key == ('0'))
    
    for (i = 0; i >= 0; i--)
    display_number(i);
    if (key == ('#'))
    
    for (i = 10; i >= 10; i--)
    display_number(i);
  
    
    //for (i = 9; i >= 0; i--)
    //{
     // display_number(i);
      //delay(1000);
     
      
    //}
    
    
   
  
}