void setup() {
  // initilizing port D
  DDRD = B11111111; //  all D port pins as output
  DDRC = B00000000;   //  all C port pins as input
  PORTC=B00001111;         //  switch ON pullup resistors (C0-C3)

}

void loop() {

byte my_var;


my_var=PINC & B00001111;     //    Read C port pins to variable


if(my_var==B00001110){
  delay(1000);
sevenseg(10);
};











  // Key 1
  if (my_var==B00001101) {

    sevenseg(3);

  }; // Key 2
if (my_var==B00001011) {

  sevenseg(2);

}; // Key 2
 if (my_var==B00000111) {

  sevenseg(1);

 }; // Key 2

}



//sevenseg aliohjelma antaa sulkuihin sijoitetun arvon
void sevenseg(char N){

  char D[22] = {
    ~B00111111, //0
    ~B00000110, //1
    ~B01011011, //2
    ~B01001111, //3
    ~B01100110, //4
    ~B01101101, //5
    ~B01111101, //6
    ~B00000111, //7
    ~B01111111, //8
    ~B01101111, //9
    ~B01110111, //A
    ~B01111111, //B
    ~B00111001, //C
    ~B00111111, //D
    ~B01111001, //E
    ~B01110001, //F
    ~B00100000, //viiva
    ~B00000001, //viiva
    ~B00000010, //viiva
    ~B00000100, //viiva
    ~B00001000, //viiva
    ~B00010000, //viiva
  };

  PORTD = D[N];

}