#define VERT_PIN A0
#define HORZ_PIN A1
#define SEL_PIN  2

int x = 0;
int y = 0;

void setup() {
  pinMode(VERT_PIN, INPUT);
  pinMode(HORZ_PIN, INPUT);
  pinMode(SEL_PIN, INPUT_PULLUP);
  Serial.begin(9600);
  pinMode(13, OUTPUT); // RED
  pinMode(12, OUTPUT); // GREEN
  pinMode(11, OUTPUT); // BLUE
}

void loop() {
  int x = analogRead(VERT_PIN);
  int y = analogRead(HORZ_PIN);
  Serial.println("X = " + String(x) + "\t \t Y = " + String(y));
  if (x == 512 && y == 512) {  // black
    digitalWrite(13, HIGH);
    digitalWrite(12, HIGH);
    digitalWrite(11, HIGH);
  }

  if (x == 0 && y == 0) {  // cyan
    digitalWrite(13, HIGH);
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
  }

  if (x == 512 && y == 0) {  // magenta
    digitalWrite(13, LOW);
    digitalWrite(12, HIGH);
    digitalWrite(11, LOW);
  }

  if (x == 0 && y == 512) {
    digitalWrite(13, LOW);
    digitalWrite(12, LOW);
    digitalWrite(11, HIGH);
  }

  if (x == 1023 && y == 0) {
    digitalWrite(13, HIGH);
    digitalWrite(12, LOW);
    digitalWrite(11, HIGH);
  }

  if (x == 0 && y == 1023) {
    digitalWrite(13, LOW);
    digitalWrite(12, HIGH);
    digitalWrite(11, HIGH);
  }

  if (x == 1023 && y == 1023) {
    digitalWrite(13, HIGH);
    digitalWrite(12, HIGH);
    digitalWrite(11, LOW);
  }

  if (x == 512 && y == 1023) {
    digitalWrite(13, LOW);
    digitalWrite(12, LOW);
    digitalWrite(11, LOW);
  }
  delay(500);
}