#define row_scan_delay 5  // delay between powering of two rows
#define column_scan_delay 5  // delay between powering of two columns ( this add to total delay by for rows)



char keypad[4][4] = {{'1','2','3','A'},{'4','5','6','B'},{'7','8','9','C'},{'*','0','#','D'}};   // This is char type 1D array 4 rows and 4 columns (16 elements (4x4))
char keyPressed;

////////////////////////////////////////////////////// SSD Codes

const int dataPin1 = 10;   //* DS /  // change to 10 and use that pin to wire it
const int clockPin1 = 11;  //* SHCP /
const int latchPin1 = 12;  //* STCP /


//////////////////////////////////////////////////////// End of SSD codes

int zero;
int one;
int two;
int three;
int four;
int five;
int six;
int seven;
int eight;
int nine;

//int DecimalCodes[] = {252, 96, 218, 242, 102, 182, 190, 224, 254, 246};
void SSDdisplay( int digitCode);

void setup()  
{
  Serial.begin(115200);

for(int i = 2; i<6; i++)
{
  pinMode(i,OUTPUT);
}

for(int i = 6; i<10; i++)
{
  pinMode(i,INPUT);
}


//////////////////////////////////////////////////////////////////////////// SSD codes

  for(int i = 10; i<13; i++)   ////################## this not updated in prevous program
   {
      pinMode(i, OUTPUT);
   }

 zero =  252; //0b11111100; //0
 one =   96;  //0b01100000; //1
 two =   128; //0b11011010; //2
 three = 242; //0b11110010; //3
 four =  102; //0b01100110; //4
 five =  182; //0b10110110; //5
 six =   190; //0b10111110; //6
 seven = 224; //0b11100000; //7
 eight = 254; //0b11111110;//8
 nine =  246; //0b11110110;//9


///////////////////////////////////////////////////////////////////////////// End of SSD codes


}

void loop() 
{
  
  for(int i=2; i<6; i++) //power up each column one by one
  {
    
    if(i>2)
    {
      digitalWrite(i-1, LOW); //power down previous column
      //Serial.print(i-1);
      //Serial.println("LOW");
    }

    if(i==2)
    {
      digitalWrite(5, LOW);  // to go back to column 1 
      //Serial.print(5);
      //Serial.println("LOW");
    }
    

    digitalWrite(i, HIGH); // power up the column
    //Serial.print(i);
    //Serial.println("HIGH");

    //Serial.println("delay");
  int row;
  int clonmn =i-1; // column number from i(i is pin number)
  bool column_State; // low or high 0 or 1

    for(int j =6;j<10;j++ )  // scan/ read each row 
    {
      row = j-5; // row number = pin number - 5
      
      
      column_State= digitalRead(j);  // read the row
      
      if(column_State==1)  // print row and columd only when row pin is high
            {
            Serial.print(clonmn);
            Serial.print(" ");
            Serial.print(row);
            Serial.print(":");
            Serial.print(column_State);
            Serial.print(" key : ");
            keyPressed = keypad[row-1][clonmn-1];
            Serial.println(keyPressed);
            //DisplaayInSSD( keyPressed);

            }
      
      delay(row_scan_delay);
      
    }

    delay(column_scan_delay);

  }
  


//////////////////////////////////////////////////////////////////////////////////// SSD codes
//display_inSSD(1);
//DisplaayInSSD('1');
SSDdisplay(96); 
delay(1000);
SSDdisplay(128); 
//display_inSSD(2);
//DisplaayInSSD('2');
delay(1000);
SSDdisplay(182); 
delay(1000);
SSDdisplay(242); 
delay(1000);



////////////////////////////////////////////////////////////////////////////////// End of SSD codes
}

void temp( int j) // j for temp
{
 int i; // for temp
//Serial.println(digitalRead(j));
      if(digitalRead(j))
      {
        Serial.print(i);
        Serial.print(" ");
        Serial.print(j);
        Serial.println();
      }

}




///////////////////////////////////////////////////////SSD codes

void SSDdisplay( int digitCode)//decimal code
{
  digitalWrite(latchPin1, LOW);
  shiftOut(dataPin1, clockPin1, LSBFIRST, digitCode);
  digitalWrite(latchPin1, HIGH);
}


void display_inSSD(int num) //  to test SSD 
{

    switch (num) 
    {
      case 1:
        SSDdisplay(96);
        break;
      case 2:
        SSDdisplay(128);
        // do something when var equals 2
        break;

      default:
        // if nothing else matches, do the default
        // default is optional
        break;
    }

}


void DisplaayInSSD( char keypresd) // to directly display the char by keypad on SSD
{
    switch (keypresd) 
    {
    case '1':
        SSDdisplay(96);
        Serial.println("display 1");
        break;
      case '2':
        SSDdisplay(128);
        Serial.println("display 2");
        // do something when var equals 2
        break;

      default:
        // if nothing else matches, do the default
        // default is optional
        break;

    }


}


///////////////////////////////////////////////////// End of SSD codes