#define ROW_1 2
#define ROW_2 3
#define ROW_3 4
#define ROW_4 5

#define COL_1 A1
#define COL_2 A2
#define COL_3 A3
#define COL_4 A4

const byte rows[]={
  ROW_1,ROW_2,ROW_3,ROW_4
};
byte b[]={B1111,B1001,B1001,B1111};

void setColums(byte b)
{
  digitalWrite(COL_1,(~b>>0)& 0x01);
  digitalWrite(COL_2,(~b>>1)& 0x01);
  digitalWrite(COL_3,(~b>>2)& 0x01);
  digitalWrite(COL_4,(~b>>3)& 0x01);
}
void setup()
{
  for(byte i=2;i<=13;i++)
  {
  pinMode(i, OUTPUT);

  pinMode(A0, OUTPUT);
  pinMode(A1, OUTPUT);
  pinMode(A2, OUTPUT);
  pinMode(A3, OUTPUT);
  }
}
void loop()
{
  for(byte i=2;i<=13;i++)
  {
  digitalWrite(2, HIGH);
  delay(500);
  digitalWrite(3, HIGH);
  delay(500);
  digitalWrite(4, HIGH);
  delay(500);
  digitalWrite(5, HIGH);
  delay(500);
  }
}