#define X0 8
#define X1 7
#define X2 6
#define X3 5

#define Y0 12
#define Y1 11
#define Y2 10
#define Y3 9

void setx(bool x1, bool x2, bool x3, bool x4){
  digitalWrite(X0, x1);
  digitalWrite(X1, x2);
  digitalWrite(X2, x3);
  digitalWrite(X3, x4);
}

void sety(bool y1, bool y2, bool y3, bool y4){
  bool yy1 = !y1;
  bool yy2 = !y2;
  bool yy3 = !y3;
  bool yy4 = !y4;
  digitalWrite(Y0, yy1);
  digitalWrite(Y1, yy2);
  digitalWrite(Y2, yy3);
  digitalWrite(Y3, yy4);
}

void setup() {
  pinMode(X0, OUTPUT);
  pinMode(X1, OUTPUT);
  pinMode(X2, OUTPUT);
  pinMode(X3, OUTPUT);

  pinMode(Y0, OUTPUT);
  pinMode(Y1, OUTPUT);
  pinMode(Y2, OUTPUT);
  pinMode(Y3, OUTPUT);

  

}


void loop() {
  sety(1,0,0,0);
  setx(1,0,0,1);
  delay(10);
  sety(0,0,0,1);
  setx(1,0,0,1);
  delay(10);

}