// this program is to interface 7segled with keypad
#include <Keypad.h>

// intializing the rows and cols on the keypad

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' }
};

byte rowPins[ROWS]={22,24,26,28};
byte colPins[COLS]={30,32,34,36};

Keypad keypad1=Keypad(makeKeymap(keys),rowPins,colPins,ROWS,COLS);

//identifying the pins of the shift register
const int dataPin=8; // connecting serial data pin in the shift register to pin 8 in arduino
const int latchPin=10; // connecting latch clock pin in the shift register to pin 10 in arduino
const int clockPin=11; // connecting shift clock pin in the shift register to pin 11 in arduino

int dataArray[10]={0B00000011,0B10011111,0B00100101,0B00001101,0B10011001,0B01001001,0B01000001,
0B00011111,0B00000001,0B00001001};

void setup() {
  // put your setup code here, to run once:
pinMode(latchPin,OUTPUT);
pinMode(clockPin,OUTPUT);
pinMode(dataPin,OUTPUT);

Serial.begin(9600);

}

void loop()
{
  char keypressed=keypad1.getKey();
  int keycode = 0;
  if(keypressed)
    {
       Serial.println(keypressed);
       String KeyNumber=String(keypressed);
       int index=KeyNumber.toInt();
       keycode=dataArray[index];

       digitalWrite(latchPin, LOW);
       shiftOut(dataPin, clockPin, MSBFIRST, keycode);
       digitalWrite(latchPin, HIGH);

    }
 }