int r1 = 2;
int r2 = 3;
int r3 = 4;
int c1 = 5;
int c2 = 6;
int c3 = 7;

int xArray[3][3]  = {
  {
    1,0,1    }
  ,{
    0,1,0    }
  ,{
    1,0,1    }
}; 


int slashArray[3][3]  = {
  {
    0,0,1    }
  ,{
    0,1,0    }
  ,{
    1,0,0    }
}; 

int state = 0;

void setup()
{
  Serial.begin(9600);
  pinMode(r1,OUTPUT);
  pinMode(r2,OUTPUT);
  pinMode(r3,OUTPUT);
  pinMode(c1,OUTPUT);
  pinMode(c2,OUTPUT);
  pinMode(c3,OUTPUT);
  Serial.println("STARTED");
}


void loop()
{
  checkSerial();
  if (state == 1)
  {
    for (int i=0;i<3;i++) {
      for (int j = 0; j<3;j++)
      {
        allOff();
        if (xArray[i][j] == 1) {
          digitalWrite(i+2,HIGH);
          digitalWrite(j+5,LOW);
        }      
      } 
    }
  } 
  else if (state == 2) {
    for (int i=0;i<3;i++) {
      for (int j = 0; j<3;j++)
      {
        allOff();
        if (slashArray[i][j] == 1) {
          digitalWrite(i+2,HIGH);
          digitalWrite(j+5,LOW);
        }      
      } 
    }

  }
}


void allOff()
{
  digitalWrite(r1,LOW);
  digitalWrite(r2,LOW);
  digitalWrite(r3,LOW);
  digitalWrite(c1,HIGH);
  digitalWrite(c2,HIGH);
  digitalWrite(c3,HIGH);
}

void checkSerial()
{
  byte inByte = 0;
  if (Serial.available() > 0)
  {
    inByte = Serial.read();
    Serial.println(inByte);
  }
  if (inByte == '1') {
    state = 1; 
  } 
  else if (inByte == '2') {
    state = 2; 
  }


}